quaternion – Struggling with 3D math concepts. Would like practice

Hello fellow game developers!

I graduate this October with my Bachelor’s of Game Programming and Development. I took the required Calculus and Linear Algebra. While I passed the classes I feel like I learned what I needed to get by, and already feel it slipping away. Can anyone recommend some good resources to practice this kind of thing? Maybe coding challenges or something like that? A lot of games in this field require a solid understanding of it, and I just need more real-world practice then I got in my courses. Thanks for any ideas!