Hey student,

If you want to score 300 marks in 10 days you should be very consistent about your studies and follow a proper revision and learning pattern exercise to chill your mind and study at least 8 hours a day achieving 300 marks in 10 days is very hard but not impossible if you are hard working you can achieve it you just have to be consistent and don't take stress.

All The best student ,

Hope this helps you.