IMO, talking with someone experienced is very much worth it, even if only to understand better what to study in your situation. Or to get feedback on your exercise sheet write-ups.
Besides, I strongly recommend you find someone at your level who wants to learn these subjects as well, so you can meet regularly and discuss exercises/unclear points for free. Discussing your half-formed ideas is more fun and results in faster learning if you can unstick/learn by explaining to each other.
Some more points:
Active learning (as in brilliant.org) seems worth a try to me as well, but I don't know if it is comprehensive enough.
Usually, lecture notes are based on (and share notation with) one or a few books, which you can fall back on if you don't understand something.
I'd be happy to tutor you; I'll PM you more information about me :)