My 11&12th basics are not good but I want to start preparation for jee main 2019 in these 3 or 6month . advice me some tips to do it.
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You need to start reading NCERT books and solve questions as much as you can to enhance your skills.Just focus on clearing your basics first then solve previous year's questions and other books like HC VERMA,RD SHARMA,OP TONDON,etc.
You need to follow a proper timetable and always clear your doubts.Focus on your studies only in this duration.
Good luck.

Dear student.
Greetings.
You can't prepare well for JEE main examination if your base of 11th and 12th is weak. You must finish your NCERT textbooks first inorder to get good marks in JEE main examination. Even if you manage to complete the NCERT textbook, you surely will clear JEE main examination.
Thank you. All the best.
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