Hello,

• 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.
And yes you can easily score 270+ marks in jee mains in 280 days.You should clear your concepts from ncert books and follow the above given books.Be motivated!
Good luck.

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