Hello there

I am extremely sorry to tell you but you haven't mention the board you belong to so I am asking you from CBSE board if you belong to any other board then do let us know.

you can get previous year question papers of biology and other subjects for CBSE board by going through our page for which link is provided below

https://school.careers360.com/articles/cbse-class-12th-question-papers/amp

These past year papers will help you to understand the types of questions which are asked in exam, you will understand the important topics which are covered in the exam by practising them, you will also get to know your preparation level .Best of luck for your examination.

Thankyou