It is very tough to score 300+ marks in JEE Main. A lot of hard work and practice is required. If your basics are clear then you can easily score good marks. Try to get a good hold on your subjects take NCERT help for that. You can make your time table. Set your daily and weekly targets. It will help you to complete your syllabus on time and you will get proper time for revision.

Give importance to the chapters which caries more weightage in the exam. Practice makes lot of difference specially in mathematics. Solving complete mock test series is very important make sure you do proper analysis. So, that you can improve your performance. It will help you to know where you stand among other competitors. Try to increase your speed as well.

All the Best for your preparation and exam!!