Criterion A: Framework for the essay
6 marksUse a clear question, suitable research methods and an effective essay structure.
IB Biology EE Grader
Grade your Biology EE before you submit. Upload your draft and get a mark for each criterion, comments tied to your sentences, and a list of what to fix first.
5 free gradings a month. No card. Private to you.
- of IA and TOK marks within one grade of the IB's final mark
- 92%
- marking score. ChatGPT 65, Claude 61, Gemini 57
- 74/100
- real IAs and TOK essays tested against the mark the IB gave
- 1,317
These results are for IAs and TOK. We haven't tested Extended Essays yet.
- Marks
- 30, from five criteria
- Length
- 4,000 words at most
- Reflection
- One RPF statement, up to 500 words
- Subject guidance
- Sciences
See the mark, and the sentences behind it
Test your research question, subject knowledge, line of argument, evaluation and reflection across the whole draft. See what is working and get a short list of what to change next.
What Marksy checks for each Biology EE criterion
You get a mark for each IB assessment criterion below. The points under each one are what Marksy looks for in your draft. See the mark bands
Criterion B: Knowledge and understanding
6 marksShow subject knowledge through relevant sources, concepts and accurate terminology.
Criterion C: Analysis and line of argument
6 marksAnalyse the research and connect the question, findings and conclusions.
Criterion D: Discussion and evaluation
8 marksWeigh the findings and assess the strengths and limits of the research.
Criterion E: Reflection
4 marks- This criterion uses the reflective statement on the RPF, rather than the essay itself.
Where Biology EEs usually lose marks
Marksy flags these in your draft and links each one to the sentences it is about.
- A plan you can't carry outCancer cell work, or tests on people or animals, often needs kit you don't have or raises ethical problems. Pick something you can measure well at school, or use published data.Criterion A
- No pilot runLiving things don't always behave. A short pilot shows whether your nitrate levels kill the roots or change nothing, before you spend weeks on the main experiment.Criterion A
- Published studies picked at randomIf your EE uses other people's data, say how you searched, which databases you used and what rules decided which studies got in. Then check they measured things in a similar way.Criterion A
- Biology at textbook levelIf you measure how fast an enzyme works, explain enzyme kinetics, not just active sites. Set out the theory your results depend on, then use it when you explain them.Criterion B
- Copied graphs, no analysis of your ownYou can reuse a graph from a paper, but the statistics have to be yours. Run your own test on the numbers and say what it means for your question.Criterion C
- Hiding results that didn't fitData that goes against your hypothesis still counts. Explain it with biology and say what you would change, instead of quietly leaving it out.Criterion D
Before you upload
- Name the species, with its scientific name, and every level of the independent variable you tested.
- If you used published studies, include your search terms and the rules you used to choose them.
- Give every table a number, a heading and SI units.
- Show one worked example of each statistical test you ran.
Your draft stays at the centre
Marksy reads the work you upload, points each comment back to your writing, and puts the most important changes first.
Does every section move the research question forward with biological purpose?Read Biology EE Planning Guide
- 1
Upload your draft
A PDF of your Biology EE, finished or not. Every comment stays connected to your own writing.
- 2
Read the comments
Highlights show which passage each comment is about.
- 3
Fix the important parts first
Work down a short list instead of making scattered edits.
- 4
Keep the final say
Accept, adapt or ignore each suggestion. You stay the author.
What students wrote afterwards
From Trustpilot, as written.
marksyib has saved my ib diploma. thanks to it, my IA's were perfect and got the points i needed. really recommended.
Marksy ib allowed me to be able to finish my IAs much before allowing me to be able to relax better. 100% recommended
Your work stays your work
Marksy reads the draft you upload and comments on it. It doesn't rewrite your assessment, and your files are never used to train AI.
Read the safety answers- Private to youOnly you can see your work unless you choose to share it.
- Never used for trainingYour coursework is not added to any AI training data.
- Feedback, not ghostwritingUse the report to improve your own analysis and decisions.
- Delete it whenever you wantYou control the files stored in your account.
Questions before you upload
Still planning? The coursework guide covers the criteria and what to ask yourself while you write. Open the guide
Yes. You can base it on published data, such as studies from several countries on a risk factor for a disease. Explain how you found and chose the studies, and do the analysis yourself.
Talk to your supervisor before you plan it. If collecting the data would be unethical or not practical, change your question or use data that has already been published.
Yes. Field work is marked on the same criteria as a lab experiment. Explain how you chose your sites and samples, and what you did about the things you couldn't control, like weather.
We tested Marksy on 1,317 real IAs and TOK essays with the mark the IB gave them. 92% of Marksy's marks landed within one grade. On a set with as many weak as strong essays, it scored 74/100 on our marking score, against 65 for ChatGPT, 61 for Claude and 57 for Gemini. We haven't tested Extended Essays yet, because the marked EEs we hold are almost all high-scoring. Every number is on the grading accuracy page.
Yes. Marksy checks your Biology Extended Essay EE against the IB assessment criteria for it and returns marks, comments and fixes instead of generic essay advice.
Yes. Early drafts are useful because the report can show a weak criterion before you spend hours polishing the wrong section. You can revise and grade another version later.
A free account includes 5 gradings a month. You don't need a card.
No. Marksy reads your existing work, explains each comment, and suggests what to revise. The writing and the final decisions stay yours.
Your upload is private to your account, is not used to train AI models, and can be deleted whenever you want.
Stop guessing what to fix in your Biology EE
Upload the version you have now and find the parts holding it back.