When I had to do it, I'd just chant them to myself over and over again in the same tone until it was seared into my brain, "Je vais, tu vas, il va, elle va, on va, nous allons, vous allez, ils vont, elles vont." Just over and over again like that. I'll never forget that conjugation because it's the first one I learned (and they're easier for me than the regular verbs just because I do this).
So basically, drill them. Quizlet them, make a song out of them, mind palace them, anything to repeat them to yourself until they're permanently in long term memory.
