HSC Exam ruled writing booklet. Print in A4 size, "Fit to paper" for correct dimensions and scaling. Note: The booklets in the HSC exam are A3 paper folded in half, so if you have an A3 printer at your disposal, use it instead.
If ur failing a basic math course, not even extension 2, maybe choose another course. I have a brother who did computer science in usyd, they do lot of math. Its only going to get worse for engineering.