So I'm in my 3rd year of my undergraduate in Math and I realize I have a lot of holes in my mathematical understanding. My fundamentals are weak and it's just going to get harder unless I start improving on them. I can barely get by on the assignments without massive intervention and spoon-feeds. What should I do? It's obvious I have to backtrack and study simpler, more fundamental topics but I have to juggle my current semester as well.

Just looking for some guidance.