i'm also writing my final exams in a couple of months and I must confess that it's very difficult maintaning my creative level but I try.
About keeping stock of idea, i find that difficult. I like to stick with the flow of things, so if I have an idea I try my best to put it on paper because if I dont I may never again. and if I dont finish it, the chancs of going back to finish it up is little.
Or, finish it after 3 months like I did...when I picked up that post it's like 300 words in with two or three paragraphs. Things clicked in magically so I could continue on it, otherwise I would just go for another idea xD
Thanks for stopping by~