to brush up on - improve your knowledge, especially when you have not used it for a period of time, to rack brains - to try hard to remember something, to make sense of - to manage to understand smth, to keep up with - make progress at the same speed as others, to come back to - remember information that you forgot, on the tip of my tongue - you are sure you know it, but you casn't remember it at the moment, to sink in - be remembered or understood, to go in one ear and out the other - to forget smth quickly, to keep your mind on - to continue to concentrate on smth, to keep it up - to continue to do smth as well as you are doing it now,

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