Hard work... Practice... And focus!

Firstly if you aren't clear about the theory portion then pull up your socks and start working really hard.

You need to work wisely so make a strategy and set a good time table. Give more time to the imp topics. Learn thoroughly the bio concert book line by line. Understand all the concepts real well

Practice as many as questions you can. Solve online mock tests . prepare flash cards for your better understanding. Do previous years papers. Everyday make a habit to sit from 3hrs n give exam.

Lastly learn frm your mistakes, rectify them. Stay positive.

You will surely crack the exam. All d best!

Hey Aspirant, You need to dedicate atleast 10-12 hours a day in order to complete the syllabus of both the classes in just one year and before referring to any other book just make sure that you are entirely done with you NCERT in every subject and you are on the tips with this. After that refer to the modules of Allen, Aakaash and kota and have some reference books tooo. That would lead you to crack the exam.

Hope this helps

Good luck