I've developed a sort of aversion to doing huge calculations most of the time (at home) I just want to plug it into the calculator and do it . This is affecting my exams, I tend to put off questions which have a lot of calculation to do and then ultimately do the calculation wrong (We're not allowed calculator use here at school in exams) . I mean, I just don't see the point . I've got the equations , the questions is solved. This tendency has been extended to simplifications as - well huge equations in variables which need to be simplified to get the answer. This is hurting me in exams . Can anyone suggest something , how to basically, stop being lazy about number crunching ? P.S : We spend a lot of time in class proving trigonometry identities , are they at all useful anywhere? I find no connection at all.