Hello,

There's no suitable strategy other than working hard and practicing enough. You need to have a good grip in the conceptual parts since the indirect questions mostly come from there. Practice everyday and especially practice the previous year papers. Some important chapters are-

Electrodynamics

Mechanics

Modern Physics

Heat & Thermodynamics

SHM & Waves

Optics

Mathematics-

Differential Calculus

Integral Calculus

Coordinate Geometry

Co-ordinate Geometry (3-D)

Matrix & Determinants

Probability

Matrix & Determinants

Trigonometry

Compulsory :
1. Chemistry - NCERT [11th and 12th] complete , NCERT Exemplar complete,Previous years AIEEE and JEE MAINS questions .
2. Physics : NCERT Exemplar[only Single Choice and Multiple Choice Questions] , H C Verma , Previous years AIEEE and JEE MAINS questions .
3. Mathematics : NCERT Exemplar , NCERT [Only  Miscellaneous Problems] , Advanced Problems in Mathematics by Vikas Gupta and Pankaj Joshi [ Only Single Choice Questions].

Optional:
1. Chemistry - Elementary Questions in Organic Chemistry by M S Chouahan , Advanced Problems in Organic Chemistry by M S Chouhan [ Only Single Choice Questions ] , Advanced Problems in Physical Chemistry by N Avasthi[only single choice questions] , Advanced Problems in Inorganic Chemistry by V K Jaiswal[Only Single Choice Questions]
2. Physics - D C Pandey [ Solved Examples and First 20 questions from each chapter]
3. Mathematics - Weak Chapters from preliepko , S L Loney , Hall And Knight .

After Completing each chapter , preapare short notes which will contain all important and not so important formulae and Mark all the important questions . This will be useful while revising a month before exam .