I'm in a bit of a dillema as I'm taking a gap year, but I'm worried that my knowledge will dilute with time as it obviously will. I'm taking sciences mostly for A level, and I'd like to be able to make notes/gather resources so in a years time I'll have my resources with me and be able to catch up on any topics with ease.

I know I won't be motivated/have the time to revist the whole of a subject, so I was wondering if anyone could give any suggestions as to how best to structure what I'm doing now so that it has maximum efficiency in the future?

My current thoughts were to make an overview of topics for each subject and stick that onto my evernote (online access notes) account. Then I'd have an overview, and for specific topics I could include a refernece point to find more details. The next level would be to put in breif information for each topic, but I doubt I'll have the time to go into such depth. I'm also looking for a way to make use of said notes, possibly by sticking in what each topic is relevant to but that will defo take a lot of time, but again much appreciate any input.