How much do you spend on each maths (in terms of percentage/hour of your whole study time/maths study time):
4 unit maths
3 unit maths
2 unit maths
Example:
1. 4 unit maths = 1 hour = 20 % of my whole study time = 50% of my maths study time
2. 3 unit maths = 1 hour = 20 % of...