You could write:
I performed the way i did because i revised/concentrated in class/ challenged myself at home and managed to get the highest mark in (the assignment name) assignment. I am very pleased of what i did and will try harder next time to get even better marks! I think i should improve on _________ and ________, I would also like to change the way/what I/did for ________.
Thank you and i hoped this helped!! ☺☺☺☺☺☺
