Learn real math or physics to really get good at these subjects. If you struggle with math or physics at school, then you may think that just trying to catch up with what is taught at school is going to be difficult enough. However, math and physics are taught in an extremely dumbed down way in schools, which can cause some students to get dumbed down as well. Just like you can't get fit by doing very light exercise that hardly strains the body, you can't get good at math by doing the high school level exercises over and over again. Someone who is not physically fit may struggle walking at a decent pace, but walking is not a good exercise to get fit.