I have a 2 unit prelim maths exam tomorrow. I know it doesn't count, but I want to try and pass. All my other 10 units are going well, maths not so much, I suck. Please, i have about 6 more hours of study in me, 3 more tonight, and 3 tomorrow early morning. What would you suggest I do in this time to maximise marks with limited knowledge on some topics. This is urgent, please!