How to lock in for quant

So yeah I do have a job but I really think I won't enjoy it. I have my last semester and I wanna lock in. There's a few things I thought of but just needed the whole picture. I've thought of studying: 1- Prob and stats from MIT OCW 2- Stochastic Calculus (idk a right source) 2- Grind codeforces and atcoder 3- Finance from MIT OCW

I want to build banger projects for the same. I also wanted to know what else should I study.