MATH151 - In this subject you learn the basics of mathematics you didn't learn in high school (because you took general maths or didn't take maths at all). You'll cover things like powers, logarithms, trig, the straight line, functions, limits, differentiation, and integration and others. It will be difficult if you're not a maths person, or you've never seen some of these topics before. I've never taken it, but I know those who have taken the subject. They've all complained that it was difficult.
As for the others, I have no clue. But you should try to follow university policy regarding study. For every credit point a subject is worth, you should study for two hours including any class time.
So you have a standard six credit point subject, you should have a total of twelve hours study. If you spend five hours in classes and lectures, that gives you seven hours to make up. This may seem unrealistic, and if it is to you, then try to at least make up the time spent in class at home (so every hour you spend in class, you spend at least one hour at home).
