Indian Institute of Science Education and Research, Mohali

Yes, you can apply for admission in IISER through jee mains rank. You can try to get admission if your rank is good then you may get admission there.

Use this link to get your answer. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=6375912.

IISER exam is divided into 4 parts and has 15 questions from Each Subject. Physics - 15 Questions
Chemistry -15 Questions
Maths- 15 Questions
Biology - 15 Questions
No Sectional Cut Offs. It is not compulsory to attempt biology but they will consider its marks in the total I. e. your marks will be out of 180. If you are a PCM Student- You can really do good in PCM Questions + Study NCERT Level Biology).
Thanks!

You need to clear IISER Entrance Exam to get into Indian Institute of Science Education and Research, for details check the link below :
https://www.shiksha.com/science/exams/iiser-entrance-exam.