{"workflow":{"id":13806,"name":"Grade PDF assignments with Google Gemini and upload reports to Google Drive","views":36,"recentViews":0,"totalViews":36,"createdAt":"2026-03-02T10:31:21.046Z","description":"## AI Assignment Grader with Automated Reporting\n\n### Who’s it for\nThis workflow is designed for educators, professors, academic institutions, coaching centers, and edtech platforms that want to automate the grading of written assignments or test papers. It’s ideal for scenarios where consistent evaluation, detailed feedback, and structured result storage are required without manual effort.\n\n---\n\n### What it does / How it works\nThis workflow automates the end-to-end grading process for student assignments submitted as PDFs.\n\n1. A student’s test paper is uploaded via a webhook endpoint.\n2. The workflow extracts text from the uploaded PDF file.\n3. Student metadata (name, assignment title) is prepared and combined with the extracted answers.\n4. A predefined answer script (model answers with marking scheme) is loaded into the workflow.\n5. An AI grading agent powered by **Gemini** compares the student’s responses against the answer script.\n6. The AI:\n - Evaluates each question\n - Assigns marks based on correctness and completeness\n - Generates per-question feedback\n - Calculates total marks, percentage, and grade\n7. The structured grading output is converted into:\n - An HTML grading report\n - A CSV file for records\n8. The final CSV grading report is automatically uploaded to **Google Drive** for storage and sharing.\n\nAll grading logic runs automatically once the test paper is submitted.\n\n---\n\n### Requirements\n- Google Gemini (PaLM) API credentials\n- Google Drive OAuth2 credentials\n- A webhook endpoint configured in n8n\n- PDF test papers submitted in a supported format\n- A predefined answer script with marks per question\n\n---\n\n### How to set up\n1. Connect your Google Gemini credentials in n8n.\n2. Connect your Google Drive account and select the destination folder.\n3. Enable and copy the webhook URL for test paper uploads.\n4. Customize the **Load Answer Script** node with your assignment’s correct answers and marking scheme.\n5. (Optional) Adjust grading instructions or output format in the AI Agent prompt.\n6. Test the workflow by uploading a sample PDF assignment.\n\n---\n\n### How to customize the workflow\n- Update the AI grading rubric to be stricter or more lenient.\n- Modify feedback style (short comments vs detailed explanations).\n- Change grading scales, total marks, or grade boundaries.\n- Store results in additional systems (LMS, database, email notifications).\n- Add plagiarism checks or similarity scoring before grading.\n- Generate PDF reports instead of CSV/HTML if required.\n\n---\n\nThis workflow enables fast, consistent, and scalable assignment grading while giving students clear, structured feedback and educators reliable records.","workflow":{"meta":{"instanceId":"ae21f7ff983ee929f98e8d7968bbd21b49d1a44f2e129169348ba847d37dd5ac","templateCredsSetupCompleted":true},"nodes":[{"id":"0ed000fc-5884-4d56-a94c-c6bf2722c173","name":"Webhook - Upload Test Paper","type":"n8n-nodes-base.webhook","position":[-1872,-464],"webhookId":"a98c19ae-7d0f-43ee-aa09-df8f4f5b0e1d","parameters":{"path":"grade-assignment","options":{"rawBody":true},"responseMode":"responseNode"},"typeVersion":2},{"id":"14bf826a-9bba-410c-9482-2578ea26b949","name":"Extract Text from Test Paper","type":"n8n-nodes-base.extractFromFile","position":[-1648,-464],"parameters":{"options":{},"operation":"pdf"},"typeVersion":1},{"id":"7acd4df7-f43b-480c-a7a3-2ea497c6ad2e","name":"Prepare Assignment Data","type":"n8n-nodes-base.set","position":[-1424,-464],"parameters":{"options":{},"assignments":{"assignments":[{"id":"studentName","name":"studentName","type":"string","value":"={{ $json.body.studentName || 'Unknown Student' }}"},{"id":"assignmentTitle","name":"assignmentTitle","type":"string","value":"={{ $json.body.assignmentTitle || 'Engineering Assignment' }}"},{"id":"testPaperText","name":"testPaperText","type":"string","value":"={{ $('Extract Text from Test Paper').item.json.data }}"}]}},"typeVersion":3.4},{"id":"243a790d-0757-4814-83d0-4d3733dc15aa","name":"Load Answer Script","type":"n8n-nodes-base.set","position":[-1200,-464],"parameters":{"options":{},"assignments":{"assignments":[{"id":"answerScript","name":"answerScript","type":"string","value":"=Question 1: Explain Ohm's Law and its applications (10 marks)\nAnswer: Ohm's Law states V=IR where V is voltage, I is current, R is resistance. Applications include circuit design, electrical troubleshooting, power calculations.\n\nQuestion 2: Describe the working principle of a DC motor (15 marks)\nAnswer: DC motor converts electrical energy to mechanical energy using electromagnetic induction. Current through armature creates magnetic field that interacts with stator field causing rotation.\n\nQuestion 3: Calculate stress in a beam under load (20 marks)\nAnswer: Stress = Force/Area. For bending stress: σ = My/I where M is moment, y is distance from neutral axis, I is moment of inertia.\n\nQuestion 4: Explain thermodynamic cycles (15 marks)\nAnswer: Common cycles include Carnot, Otto, Diesel, Rankine. Each involves heat addition, expansion, heat rejection, compression stages for energy conversion.\n\nQuestion 5: Discuss Boolean algebra and logic gates (10 marks)\nAnswer: Boolean algebra uses AND, OR, NOT operations. Logic gates implement these: AND gate outputs 1 only when all inputs are 1, OR gate outputs 1 when any input is 1."}]}},"typeVersion":3.4},{"id":"a3932528-d56a-49c1-9242-c26cf539f43f","name":"AI Agent - Grade Assignment","type":"@n8n/n8n-nodes-langchain.agent","position":[-976,-464],"parameters":{"text":"=You are an expert engineering professor grading student assignments. \n\nANSWER SCRIPT (Correct Answers with Marks):\n{{ $json.answerScript }}\n\nSTUDENT SUBMISSION:\n{{ $json.testPaperText }}\n\nGrade this engineering assignment by:\n1. Comparing student answers against the answer script\n2. Award marks based on correctness, completeness, and technical accuracy\n3. Provide detailed feedback for each question\n4. Calculate total marks obtained\n\nProvide output in this JSON format:\n{\n \"questions\": [\n {\n \"questionNumber\": 1,\n \"maxMarks\": 10,\n \"marksObtained\": 8,\n \"feedback\": \"Good explanation of Ohm's Law but missing practical examples\"\n }\n ],\n \"totalMarks\": 70,\n \"totalObtained\": 55,\n \"percentage\": 78.57,\n \"grade\": \"B+\",\n \"overallFeedback\": \"Strong understanding of core concepts with room for improvement in practical applications\"\n}","options":{"systemMessage":"You are a precise grading assistant. Always return valid JSON only."},"promptType":"define","hasOutputParser":true},"typeVersion":1.7},{"id":"27d5f8e7-2af0-4df9-9420-0eca38b94e04","name":"Structured Output Parser","type":"@n8n/n8n-nodes-langchain.outputParserStructured","position":[-832,-240],"parameters":{},"typeVersion":1.2},{"id":"95194943-b7c5-4a0c-a2f5-a0a9ab3243b9","name":"Generate Results Table","type":"n8n-nodes-base.code","position":[-624,-464],"parameters":{"jsCode":"const gradingResult = $input.first().json;\nconst studentName = $('Prepare Assignment Data').first().json.studentName;\nconst assignmentTitle = $('Prepare Assignment Data').first().json.assignmentTitle;\n\n// Create HTML table\nlet htmlTable = `\n

Grading Report: ${assignmentTitle}

\n

Student: ${studentName}

\n\n \n \n \n \n \n \n \n \n \n`;\n\ngradingResult.questions.forEach(q => {\n htmlTable += `\n \n \n \n \n \n \n `;\n});\n\nhtmlTable += `\n \n \n \n \n \n \n \n \n \n
QuestionMax MarksMarks ObtainedFeedback
Question ${q.questionNumber}${q.maxMarks}${q.marksObtained}${q.feedback}
TOTAL${gradingResult.totalMarks}${gradingResult.totalObtained}Grade: ${gradingResult.grade} (${gradingResult.percentage.toFixed(2)}%)
\n

Overall Feedback: ${gradingResult.overallFeedback}

\n`;\n\n// Create CSV data\nlet csvData = \"Question,Max Marks,Marks Obtained,Feedback\\n\";\ngradingResult.questions.forEach(q => {\n csvData += `\"Question ${q.questionNumber}\",${q.maxMarks},${q.marksObtained},\"${q.feedback.replace(/\"/g, '\"\"')}\"\\n`;\n});\ncsvData += `\"TOTAL\",${gradingResult.totalMarks},${gradingResult.totalObtained},\"Grade: ${gradingResult.grade} (${gradingResult.percentage.toFixed(2)}%)\"\\n`;\n\nreturn {\n studentName,\n assignmentTitle,\n htmlTable,\n csvData,\n gradingResult,\n summary: `${studentName} scored ${gradingResult.totalObtained}/${gradingResult.totalMarks} (${gradingResult.percentage.toFixed(2)}%) - Grade: ${gradingResult.grade}`\n};"},"typeVersion":2},{"id":"26226c89-7643-472c-9fea-b14e2370eb63","name":"Convert to CSV File","type":"n8n-nodes-base.convertToFile","position":[-176,-464],"parameters":{"options":{},"binaryPropertyName":"=result-{{ $json.body.studentName || 'Unknown Student' }}"},"typeVersion":1.1},{"id":"da46bbc9-f392-4c18-b2e8-2c84506854dd","name":"Prepare CSV Data","type":"n8n-nodes-base.set","position":[-400,-464],"parameters":{"options":{},"assignments":{"assignments":[{"id":"data","name":"data","type":"string","value":"={{ $('Generate Results Table').first().json.csvData }}"}]}},"typeVersion":3.4},{"id":"2eb6444f-ec80-4d99-9cda-16f3ffdb908b","name":"Google Gemini Chat Model","type":"@n8n/n8n-nodes-langchain.lmChatGoogleGemini","position":[-976,-240],"parameters":{"options":{}},"credentials":{"googlePalmApi":{"id":"0qx7MVBn4PpeYK6I","name":"Google Gemini(PaLM) Api account"}},"typeVersion":1},{"id":"2d334fb3-448f-4bcf-b6ee-5516c1aef5ae","name":"Upload file","type":"n8n-nodes-base.googleDrive","position":[48,-464],"parameters":{"name":"=result-{{ $json.body.studentName || 'Unknown Student' }}","driveId":{"__rl":true,"mode":"list","value":"My Drive"},"options":{},"folderId":{"__rl":true,"mode":"list","value":"root","cachedResultName":"/ (Root folder)"},"inputDataFieldName":"result-{{ $json.body.studentName || 'Unknown Student' }}"},"credentials":{"googleDriveOAuth2Api":{"id":"7nvLmKspGdNiv8rk","name":"Google Drive account"}},"typeVersion":3},{"id":"9b832100-ecbc-4d17-bba2-5039bdfa4157","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[-2560,-768],"parameters":{"width":560,"height":464,"content":"## AI Assignment Grader\n\n\n### How it works\n1. The workflow triggers when a student's test paper is uploaded via a webhook.\n2. It extracts text from the uploaded PDF and loads a predefined answer script.\n3. An AI model compares the student's submission against the correct answers, providing detailed feedback, marks per question, and a total score.\n4. A comprehensive grading report is generated in both HTML and CSV formats.\n5. The CSV grading report is then uploaded to your specified Google Drive folder.\n\n\n### Setup\n- [ ] Connect your Google Gemini account.\n- [ ] Connect your Google Drive account.\n- [ ] Configure the Webhook URL to receive test paper submissions.\n- [ ] Adjust the 'Load Answer Script' node with your specific assignment's correct answers and marking scheme.\n- [ ] Select the target Google Drive folder for saving graded reports."},"typeVersion":1},{"id":"3f2f4532-bb4b-4f3a-8593-52f998c2b1de","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[-1936,-544],"parameters":{"color":7,"width":656,"height":288,"content":"## Get question paper\n"},"typeVersion":1},{"id":"b85e3a83-db4b-4b30-943c-c1a5521a275c","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[-1216,-544],"parameters":{"color":7,"width":736,"height":464,"content":"## check answers "},"typeVersion":1},{"id":"a63b898a-15a8-4c45-a741-6aaffc075733","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[-464,-544],"parameters":{"color":7,"width":704,"height":256,"content":"## upload result to drive"},"typeVersion":1}],"pinData":{},"connections":{"Prepare CSV Data":{"main":[[{"node":"Convert to CSV File","type":"main","index":0}]]},"Load Answer Script":{"main":[[{"node":"AI Agent - Grade Assignment","type":"main","index":0}]]},"Convert to CSV File":{"main":[[{"node":"Upload file","type":"main","index":0}]]},"Generate Results Table":{"main":[[{"node":"Prepare CSV Data","type":"main","index":0}]]},"Prepare Assignment Data":{"main":[[{"node":"Load Answer Script","type":"main","index":0}]]},"Google Gemini Chat Model":{"ai_languageModel":[[{"node":"AI Agent - Grade Assignment","type":"ai_languageModel","index":0}]]},"Structured Output Parser":{"ai_outputParser":[[{"node":"AI Agent - Grade Assignment","type":"ai_outputParser","index":0}]]},"AI Agent - Grade Assignment":{"main":[[{"node":"Generate Results Table","type":"main","index":0}]]},"Webhook - Upload Test Paper":{"main":[[{"node":"Extract Text from Test Paper","type":"main","index":0}]]},"Extract Text from Test Paper":{"main":[[{"node":"Prepare Assignment Data","type":"main","index":0}]]}}},"lastUpdatedBy":1,"workflowInfo":{"nodeCount":15,"nodeTypes":{"n8n-nodes-base.set":{"count":3},"n8n-nodes-base.code":{"count":1},"n8n-nodes-base.webhook":{"count":1},"n8n-nodes-base.stickyNote":{"count":4},"n8n-nodes-base.googleDrive":{"count":1},"n8n-nodes-base.convertToFile":{"count":1},"@n8n/n8n-nodes-langchain.agent":{"count":1},"n8n-nodes-base.extractFromFile":{"count":1},"@n8n/n8n-nodes-langchain.lmChatGoogleGemini":{"count":1},"@n8n/n8n-nodes-langchain.outputParserStructured":{"count":1}}},"status":"published","readyToDemo":null,"user":{"name":"Pixcels Themes","username":"pixcelsthemes","bio":"Pixcels Themes is a modern AI Automation Agency helping businesses streamline time-consuming tasks through intelligent automation. We build practical AI solutions—from automated workflows and Shopify integrations to custom chatbots and tailored AI agents—that replace manual work with smart, self-running systems. Our focus is simple: make businesses faster, more efficient, and ready for the AI-powered future","verified":true,"links":["https://pixcelsthemes.com/"],"avatar":"https://gravatar.com/avatar/8bed9508a66c5ad6bd2d44420791c329d4eba9fa0dee5de5e7a42a1eadb39080?r=pg&d=retro&size=200"},"nodes":[{"id":38,"icon":"fa:pen","name":"n8n-nodes-base.set","codex":{"data":{"alias":["Set","JS","JSON","Filter","Transform","Map"],"resources":{"generic":[{"url":"https://n8n.io/blog/learn-to-automate-your-factorys-incident-reporting-a-step-by-step-guide/","icon":"🏭","label":"Learn to Automate Your Factory's Incident Reporting: A Step by Step Guide"},{"url":"https://n8n.io/blog/2021-the-year-to-automate-the-new-you-with-n8n/","icon":"☀️","label":"2021: The Year to Automate the New You with n8n"},{"url":"https://n8n.io/blog/automatically-pulling-and-visualizing-data-with-n8n/","icon":"📈","label":"Automatically pulling and visualizing data with 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