0I am generally very good at remembering things, so here are a few tips:
1. Know how many you need to learn. Write them all down on one page and number them. Say, for example, you have 20. Then write the numbers 1-20 down on a blank sheet of paper and try to come up with as many as you can from memory. This way you can eliminate the ones you know almost straight away and concentrate on the ones you dont know. repeat this exercise several times until you are satisfied. Always write out all the list because you can't count on not forgetting the ones you got right the first couple of times.
2. How to make the above easier? Try and put the equations into groups that are linked. So, for example, know that you need to know 3 trig identities, 4 equations of motion, 3 gas laws etc etc. That means that when you go to write out all the equations at once you can do them in managable chunks.
3. UNDERSTAND the equations. After all, equations are just the representation of things you should already know. If you try to understand how they are derived, then it makes them easier to remember. In some cases, this might not be possible, but it applies in most cases imo.
4. when all else fails, check the units. If you are talking about equations where units are involved, you can sometimes check to see whether both sides of the equation are the same units. As a simplified example, speed=distance/time if you put miles and hours on the rhs, you get mph, which is the correct unit for speed. For the area of a circle, you know that 2*pi*r is not correct because that will only give you units of m whereas area is measured in m^2.
As an aside, I learned all the capital cities in the world because a friend dared me to. My memorisation list was numbered at over 200. It is especially useful to keep wrting them out and testing yourself. Just reading them over isnt nearly as effective.
