Sometimes the sequence is up to you, sometimes the provider or school requires you to follow a specific sequence.
Give a look at Bristol GS modules (split in 3 parts), CATS Aviation (split in 3 parts), OAA (split in 2 parts) and CAPT (split in 3 parts).
I really like the way it is structured at CAPT.
http://www.pprune.org/professional-p...ml#post8968945