Answer:
English: I do well on short assignments. I need to do better this year than last year on long assignments.
Math: I should work more carefully on my homework than I did last year.
Science: I work the fastest in the labs. I clean up the best of all. I need to improve this.
Explanation:
you will find the changes underlined above^^
fixed the first sentence that needs improvement by adding the word better
added the word more in the next sentence that needed fixing
changed faster to fastest on the fourth
and finally, changed better into best
