i think you're better off keeping it. i dropped 3u maths and went down to 2u thinking that dropping that extra unit would give me more time to devote to my other subjects but that didn't end up happening. i just wasted that extra time lols. so i think you're better off keeping it and just keep on working through it. try not to bludge as much, and concentrate in class more. if you put in some effort, you never know what will happen.
i kinda know how you feel, about maths ^^;". i absolutely hate it too and i'm not doing that well in it compared to my grade but i'm going to try and rough it out because it's one of the few subjects i do that doesn't have an element of subjectivity in the marking and if i get it, i can get marks in it =.=''