Pinkster and Pianorak
Don't look at Nav and Met as something to learn parrot-fashion. They are both "practical" subjects, a bit like language: once you can speak it, it's a doddle. Common sense will get you a long way, once you've got your brain round the basics.
There isn't that much "detail" stuff that you need to know, it's mostly about interpreting.
For met, that means "interpret what you see on the charts". Download a 214 and a 215 every day or so, and look at each to see what it's telling you. Ask yourself a few questions about the weather at various places, then look to see if you got it right.
I find that the 214 and 215 (or their continental equivalents) tell me pretty precisely what to expect, and whether or not to go flying. Then I look at the TAFs and METARs for home, destination, and major places enroute to confirm the diagnosis. That's "coarse flying" but it works!