Anything you're stuck on, go on youtube. Do rounding signifcant numbers or anythng relating to your topic. Youtube is an excellent place for maths videos, it will help y.o.u. 100%. Solve maths questions, solve anything. Do one thing, anything you find hard, do that first. Mark that topic, and do as many questions, but if you can't understand,youtube will be the better choice, as it will help you.