I cover mostly syllabus for kvpy sa stream what I do now but my mock test are not good
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When you prepare for something it is not only necessary to cover the syllabus but practice is more important. You have to keep on practicing all the chapters that you have completed of Mathematics, Physics and Chemistry. As biology is a completely different subject that doesn't require you to practice any formulas ,you need to revise and learn it daily so as to jog your memory. Finally,even if your scores are not upto the mark in mock tests,keep on doing them as mock tests are the key to scoring good marks. Eventually,you'll learn by doing and can score your expected marks in KVPY Exam. All the best.
Hope you are doing well ! If you have cover all the syllabus for your exam then do previous paper as much as you can do it will help you a lot .All the exams are not about to finish the syllabus they need a lot of startegy and I think you have not that proper startegy so attempt mock and previous year Then only result will be in your favour!