Your question has been heard loud and clear.
Best ways to get good scores:
Listen to cool music.
Well also , whenever you study take short breaks in between and also , in these breaks , reward yourself for studying hard , and then go back to studying.
Imagine yourself getting 60% and above for the history and biology exam , think what good things will befall you once you get good marks and how you will remain happy.
Also , keep repeating phrases like ''I will score good marks this time'' in your head , and trust me , you will believe that you really can score good marks and you will want to achieve your goal.
Also , drink energy drinks like monster during studying
Also , try deep breathing. Like breathing in and out slowly. It increases concentration
Thank you