Well the diploma that I did required three subjects at a standard level (I did English, French and Chemistry) and three subjects at a higher level (Maths, Physics and Geography).
The maths and physics classes I were taking were the hardest classes my school offers, and the classes both had only six people in them lol. So yeah, I'm not going to lie, those classes were ****ing difficult and I'm a little worried about how I did in them. I should be fine, though.