Don't be afraid to talk about how you feel if you are a boy. If you are a girl, ask how the person is feeling, instead of assuming you know.
Expand your vocabulary. Reading.
You can improve your behavior by putting like a rubber band on your wrist and whenever you did something bad smack it against your wrist
You could improve your Science in many ways, depending on your age. For example from KS2 to GCSE standard, you can visit BBC Bitesize, a website that tests your knowledge and teaches you things about...
the way you speak and body language given off, if that helps :)