Physics !!! SUVAT problemWatch
When I was in sixth form the school provided some after school catch up lessons for 'maths for science' which gave people who were not doing maths or needed to catch up a fighting chance.
There are resources like this on the internet which help and I would consider asking for help from your teacher.
Posted from TSR Mobile
Using SUVAT it would depend on the question as to how to re-arrange for T as the subject. Reason being you could get given different variables for different questions, so you can't use the same formula.
For example, if you were given initial speed, final speed and distance travelled then you would need s=[(u+v)/2]t; however if you were given acceleration instead of distance then you would need v=u+at.
Hope that helps.
edit: If you're struggling in general with re-arranging equations then I have explained a bit about the principles of re-arranging equations here: http://www.thestudentroom.co.uk/show....php?t=3463387