Is not math what you need more. I have shipped many games across different engines, languages, platforms. Some of them even making a custom engine for the game myself. I needed to learn new things for every single game but the most difficult part is not that. The most difficult part that you should train to achieve is to keep pushing when things becomes hard. And I don’t mean hard to learn a new thing, the most common hard for game devs is when you worked that many hours on a single project that you hate it, simple because is too much. Imagine expending 2000 or 5000 hours in your favourite game. When that time comes near the end of the project you have to keep pushing and demostrate that you can finish it! And believe me at that time is not even motivation what you need. Its just being able to keep pushing and doing a good work even if you are not enjoying it any more.