Clish:
Maths is basic
Fractions
Decimals
Pythagoras
1in60
Times fractions
Divide fractions
Times decimals
Divide decimals
Mix fractions and decimals
Simple times
Simple divide
Just large numbers so they take time.
Just practice random combinations of the above list and you'll be fine.
I'm not going to give exact questions on this on and answers, cause lets face it if you cant work out a ground speed or how far off track you are with 1in60 then what have you been doing with your current flying?