If it is a lot of music to deal with, write down items that need work. Keep a journal of what practice techniques were successful, as well as those that did not work.
Record yourself regularly. Not just performances, but practice sessions, and in-progress music as well. Think of this as a recording journal of your practice. Another advantage, is that you will get accustomed to having the microphone present when you play.
As you gather more experience, you will acquire the ability to estimate how long a particular piece might take to learn, and can better create learning plans for music. This is where keeping a journal also helps, as it gives you a point of reference to continually update as you progress. Eg: if you kept journal entries that Piece A took X amount of time to learn, than you can create a practice plan for Piece B, which is of similar difficulty as Piece A.