15 degrees = 1 hr time difference, 1 degree = 4 mins time difference?
Dividend yield formula which is yr 11 but can be asked in exam multiple choice, dont know it off the top of my head though
Capture recapture formula or be able to work it out in your head
Not a formula but I always forget which way round positive and negatively graphs are
Make sure you know your distribution things, not sure of the name for standard deviation and z scored, like 68% of scores will have z score between -1 and 1, 95% between -2 and 2 etc
Direct and inverse variation if you don't know that one
Probability things like how to calculate probability for ordered and unordered events
Not sure if that will help but I just copied things I have on my own little 'remember for tomorrow' list, but I hope at least somethings useful