Hello,

Your marks with 40%tile would be somewhere around 15-20. I think you didn't check the answer key because if you had corrected 20 out of 25 then the marks scored by you would be 75 and the percentile would be around 85-90.

I would suggest you do the following things:

1. Do more question practice, because lack of question practice will lead you to negative marks in exams. Right now, the best source to do question practice is the previous year's question. Do as many as you can.
2. For the second attempt do only JEE main session 1 exam question paper and learn from your mistakes.
3. Revise/learn all formulas in physics, it is coming relatively easy. Questions are asked directly formula based. If you anyhow manage to learn the formula and its application then you will be in a lead from others.
4. In chemistry revise inorganic chemistry for at least one hour and try to complete chapters like Polymer, Biomolecules, Chem I'm everyday life, Surface chem etc.
5. Fir maths do only those chapters which you find easy. Don't forget to prepare mathematical reasoning.

Hope it helps, all the best.