Hello Aspirant, First of you should take print out of the JEE Main Syllabus and buy a book which has past years JEE Main papers(Like a book 19 years JEE Main is in the market) Chapter wise, Now by seeing syllabus and Past years paper you will get ideas of What types of questions comes in Exam and level of questions and which chapters has how many questions. Now Use use first 6 months for covering full syllabus and doing past year questions and then the next 2 months into parts First 40 days you have to revive and do questions for a detailed revision and the next 20 days for a quick revision.

Divide the syllabus into 3 parts Easy chapters, Moderate Chapters and Hard Chapter, At a time do (3 easy +2 Moderate +1 Hard) chapter, this will cover your whole syllabus and you will have a strong grip on easy chapters, which will maximise your marks.