Here is a little rhyme, courtesy of From Here to Fraternity By Robert Egan:

This is Greek and how they spelt her-
Alpha, Beta, Gamma, Delta,
Epsilon, Zeta,
Eta, Theta,
Then Iota, Kappa too,
Followed up by Lambda, Mu,
Nu, Xi,
Omicron, Pi,
After that, Rho, Sigma, Tau,
Upsilon, Phi, and still three more,
Chi, Psi, and Omega's twenty-four.


Give it and try and please post again if it works. Happy memorizing.