Would be extremely happy to help :) 

The first thing you need to do is start as early as possible: the more the time you have in hand the better it is. Start preparing slowly with the basic topics from every subject and try to grasp the concept. You should have an in-depth knowledge about the fundamentals because that is what everything later is going to be based upon. 

Chalk out a schedule for yourself. Make a 2 year plan. In the first few months you have to get yourself in a habit of studying for 8-9 hours per day. Join a good coaching institution if there be the need. Good institutions can guide you and also provide you with ample of materials to study from. Solve online mock tests and past year papers. Within the end of one year, you should have finished with 90% of the syllabus. Take the rest of your 6 months to complete the remaining syllabus and revise. The last 6 months are your brushing up months. Polish your skills by recognizing areas of improvement through continuous practice of exams. While doing all of these, make sure you have fun and enjoy the most because nothing is as victorious as a happy mind.

The amount of efforts and amount of dedication you out in shall correspond to results you achieve.

As per many toppers, the important aspect is time management where many of them devote 6 hours daily for studies and 1 hour for revision and mocks of the chapters dey cover.

There are abundant books available in the market, However some top Books for indepth Preparation are shared below.

Physics:- 

Concepts of Physics Vol I and II by H.C. Verma

.New Pattern JEE Problems: Physics by DC Pandey.

Chmeistry:-

Organic Chemistry by O.P. Tandon

Numerical Chemistry by P.Bahadur

Mathematics:-

Maths XI & XII by R.D. Sharma

All the above books have been recommended by various toppers.

Some top critical things toook out for are shared below:--

1. Solve numerical problems as many as possible

At least try to solve 60 problems from day 1 including PCM.

Solvibg atleast 200 questions from each important chapter will eliminate your doubts.

2. Always note down your mistakes

Keep track of your efforts so you never commit the same mistake repetitively.

3. Make a target Goal for every day

Its good to have a target so you know what youre working towards. Always aim to achieve that and strive forward to achieve bigger and better.

4. Develop a subject-wise strategy

Spend more time with difficult subject as there is more scope for improvement and keep resolvibg doubts ubtill they are cleared.

5. Fight until exam ends and persist your efforts.

Give your best till the end. Do not give up if you're scoribg low, have patienece it will pay you Big.

6. Target the difficult parts of the syllabus

Focus first on the difficult topics along with concise, crisp, easy-to-look up notes. make sure your evise those notes untill you dont committ same msitakes.

7.Analyze previous year paper pattern

Strategise your study plan accordingly based on the previous years patterns and weightages and how much time you devote to each question.

Golden Tip:--

Analyse Mock exams to identify weak areas and devote timefor solved problems from the books on such topics, try to revise them regularly such that your weakness becomes your strength.