Hi Aditya,

first of all, during your preparation, you should have to be punctual, hardworking, and be honest with your self. First of all analyze your weak subjects, weak topic and according to what you have analyzed, make a timetable, according to your needs and distribute more time to that subject or particularly to that topic in which your weak.

Chemistry:-

For chemistry, you can follow Arvind Arora on youtube and Sachin Rana on Unacademy platform. These are some great educators who can help you during your preparation.

You can refer NCERT for your preparation and please give full justice to it.

Other books you can also refer are OP Tondon (physical and inorganic chemistry), Arihant publication(organic chemistry).

Physics:-

For physics, you can follow Pradeep Kshetrapal on youtube, he will make all of your basic concept clear as far as any topic in physics is considered.

You can refer HC Verma for physics and please go through all solved example once. You can also  refer DC Pandey

Maths:-

You can watch out for Manoj sir on Unacademy platform, for any guidance in mathematics.

Books you can refer are NCERT, RS Aggarwal, RD Sharma.

Biology :-for understanding topics you can follow Pranav on unacademy platform and you can refer books such as NCERT, ABC biology, Pradeep's Publication Biology.

Reasoning :-for reasoning you can refer books such as RS Aggarwal

Keep making short notes and formula cheat sheet which will be very useful at revision times .keep practicing question which will increase your accuracy as well as your speed. And also give test series which will give you a perfect idea about where you stand among your competitors.

Best of luck for your preparation.