Hello,

For NEET preparation, firstly you should know the detailed syllabus and the pattern of exam. You should be through with the NCERT text. Clearing of concepts is important. Follow a proper study routine and devote time to each subject. Solving previous year question papers and giving mock tests is also necessary part of the preparation.
Refer to the link below for detailed preparation tips, important books and other details-

 https://medicine.careers360.com/articles/neet-2019

About marks, see, admission to government medical colleges is on the basis of 15% All India Quota and 85% state quota. Cutoff vary for AIQ and state quota. Cutoff also vary category wise. So work hard, prepare well and try to score good marks to get admission.

Good Luck!

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