Hello,
To score 600+ is possible oly if you know the basics of the subject really well. I assume that you are asking about NEET. Once you the basics it is possible to score really well by solving a lot of previous years papers and mock question papers on a daily basis . This helps you to recollect the formulas, gives you an idea on where you have to improve and will also help you to manage time better and familiarise the exam pattern.
Also If you have to study some chapters more now then it. would be wise t select those chapters which have more weightage. Below I have shared with you a link where you will get the weightage chapterwise and the important topics for the NEET syllabus:
https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics
Good Luck
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