I come from eletronic engineering background (emphasis on digital area) and even thou I have to work on the development of something specific with Fast Fourier Transforms and have to read again old books to refresh knowledge I already have touched in the past (25 years ago to be precise), so no worries, the best you can do is to look after the stuff you need at the exact moment the need appears. It is more beneficial to your brain learn different things at a period of time than just only one thing at each same period… it is just how the brain works, you will not overload it, even thou you might think it is too much. We handle this since birth.
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