I made up my own when I was doing my A-Levels, Kellogs Packeted Cornflakes Often Fill Goats Stomachs, K P C O F G S
Ah, you have a biology A level, then? Bet you can't remember the Krebs cycle!
Necessary is easy if you learned latin. The latin word has a hard C - "ne
kessy". Once you know that, remembering the double S is easy. Necesse est mihi discere...
The I before E rhyme is useless to me, because you can make it rhyme with almost any letters in it.
T before V except between E...
N after C except before T...
For that one, I need a mnemonic to help me remember the mnemonic. Unless anyone has a better one - I could use it.
Oh yes, and Mother Very Thoughtfully Made a Jam Sandwich Under No Protest for the planets. (It's even got the asteroids in there).
Guitar strings: Eagles And Doves Groan Before Eating.