Hello,
If you are eligible for the exam then just give your best. You can't prepare as per marks or rank. It's unpredictable. Just make  hard work and with sincere practice and preparation you can score good marks and a rank which will make you able to join a college.
It's okay if your mark is low. You just have to satisfy the eligibility criteria. That much will do the work.
Practice well and devote your time in understanding concepts and solve numericals with steps. Understand Every step and know why it is done like that.
Questions are not easy and it's really tough as it feels like you haven't studied anything like this. This can only be counterattack by lots of hardwork, practice and smart planning.
Hope it helps!

IISER Mohali

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