Replying to Math.....

so im curently in math 10 principles and im doin really bad.The last test i did i know i failed and i wasent even close to passing.I try pretty hard but im starting to give up because its so hard for me.my question is should i stay in principles and not get a very good mark and have a little chance of passing or should i just go into applications so i can get a b or better.goin into apps will affect me in the long run for sure but i dont want to fail math 10.i know im goin to have to switch next year because it will get even harder so idk what to do.