Any last physics tips for exam/Formulas not to get confused together?

[Theo1290]

Doing a physics exam, realised F=qvb is v= velocity not V=voltage. Something my tutor had specified wrongly. Are there any formulas I should really make sure to have on my cheat sheet, and know not to mix up?

 Also how do they mark the graph (I'm hoping there's a 5 mark graph question because it's easy marks), does my best line of fit have to be from 0 to the highest point on the graph, or only from lowest point to highest point. And if I have to calculate gradient, can I just use the values given. (y2-y1/x2-1) I saw in a previous exam there was a range in which the gradient was allowed to be, and I think exam report said students aren't allowed to use the values given- which doesn't make sense to me; why are we expected to come up with our own values from looking at our graph)

[Sai Ramishetty]

Doing a physics exam, realised F=qvb is v= velocity not V=voltage. Something my tutor had specified wrongly. Are there any formulas I should really make sure to have on my cheat sheet, and know not to mix up?

 Also how do they mark the graph (I'm hoping there's a 5 mark graph question because it's easy marks), does my best line of fit have to be from 0 to the highest point on the graph, or only from lowest point to highest point. And if I have to calculate gradient, can I just use the values given. (y2-y1/x2-1) I saw in a previous exam there was a range in which the gradient was allowed to be, and I think exam report said students aren't allowed to use the values given- which doesn't make sense to me; why are we expected to come up with our own values from looking at our graph)

Small g- gravitational field
Big G-  gravitational constant

[Theo1290]

Thanks!