Hello

Test series are very important to practice and to enhance speed. Since you are a repeater, you must be well aware about the syllabus and concepts. You need to work on your speed and accuracy.
Join unlimited test series and practice as many questions as you can.

After completing any mock test, you should analyze the result and work on your weak areas accordingly.

Analyzing and improving from your mistakes in necessary.

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Study the concepts in depth, don't read superficially.

Try to clock 100 hours a week.

Maintain your health

Sleep is crucial, else you'll get exhausted before time.

Form a study group, discuss with friends

Stay motivated.

No pain no gain, you won't get this opportunity again. Make the most of it.

Donot waste time, invest time.

Revisions are the most important

It is said that hand written notes are well remembered than printed material, make your own notes, keep reading it again and again.

The best books you can refer to are the NCERT,

For biology, refer the following.

1) Trueman's Biology vol 1 and vol 2

2) Dinesh- Objective biology

3) Pradeep publication Biology

4) GRB'S Publication Biology.

For Physics refer to he following books.

1) H.C.Verma - Concepts of Physics.

2) D.C Pandey - Objective Physics.

3) Fundamentals of physics by Walker

4) Problems in Physics by I.E.Irodov

For chemistry you can refer the following books

1) O.P Tandon - Physical Chemistry

2) Morrison and Boyd - Organic Chemistry

3) Modern ABC's of chemistry

4) J.D.Lee Inorganic chemistry

5) Dinesh

Ncerts are mandatory to have, refer the rest of the books and find out which one suits you. I would advice you not to buy all the books but to refer them and see which one is better for you.

In the end it doesn't depend upon which book is better but how good can you understand the concepts

Also, for the general knowledge subscribe magazines, they will be useful.

also I am attaching a link please go through it hope you find it helpful

Feel free to ask me in the comment box if you are having any further doubts

hope you find it helpful

Good Luck!