Hi Buster,
Like you i initially found all that info a bit overwhelming so I used to make up little rhymes, stories, pictures, etc. To give you one small example:
In Nav (and planning) - point of equal time / point of no return.
I always used to get these mixed up. So i made a mental picture of 2 animals (please stay with me on this one)
PNR:
PNR stands for panier which is worn by the donkey. The donkey says, "e-oh"
hence:
PNR = EOH
------
O+H
....now this method seems ridiculous, and it is, but if it works...
Everyone in my class who came out of the Nav exam [having previously mocked my technique] said they remembered the equation because of the donkey.
The other one is PET
the pet is a dog which lives in the Dog House
hence:
PET = DH
-----
O+H
The more ludicrous the picture, the more likely you are to remember it. Try it, it may work for you. If there is anything specific you are having dificulty with, PM me and I will try my best to help.
HG