for the project you can go for
1) probability theorem verification
2) Pythagoras theorem's physical proof
3) you can choose to demonstrate any theorem from geometry
4) practical verification of AP formulas
Practice, only practice make us good in maths, you should work on math worksheets. Maths worksheets are come with good ratio of problems to solve, As we know maths required more practice than other subjects.**broken link removed** are these type of problems.