Quants Revision! Need YT suggestions!

Hey guys, I'm in a bit of a pickle and need some help with quants revision. I haven't been able to practice for a few days due to some personal issues, and now I feel like I'm back at square one. I have an upcoming window with 4 days at home, and I want to make the most of it by completely brushing up on quants. I'm looking for a YouTube channel or playlist that can help me quickly revise all the tricks and formulas, so I can focus on practicing and attempting mocks. Any suggestions would be greatly appreciated! 

Any suggestions would be greatly appreciated!