It's not that insane

Basically, you need to do 300 points of study over 3 years. 100 points a year, every subject is 12.5 points (yes some aren't but deal with that if it matters).
Level 1 = first year, level 2 = second year, level 3 = third year
You do not need to do 8 level 1, 8 level 2 and 8 level 3 subjects. You cannot do more than 10 level 1 subjects. You do not need to do only level 1 subjects in first year and so forth.
I don't know what your goal is for your degree, but in first year you'll probably be taking your basic subjects - maths, physics, biology, chemistry etc. depending on what you hope to major in. They will mostly be level 1. You can fill in any gaps with any subjects you're allowed to take. In second year, you'll do mostly level 2 subjects, the direct prerequisites for the subjects in your major. In third year, you'll do a major (level 3 subjects) plus anything else you feel like (ie the 2-4 spaces left over, because a major is 4 subjects)