Best resources to learn Maths for Research?

I'm a student learning NLP. I want to be researcher. I'm still in school. I have managed to learn Maths request for NLP and DL. But I want to take it to research level. So, what maths topic do I need to learn and also please tell me some research papers that I can read. I have learned till encoder decoder model. I was doing some projects and now I will move to attention mechanism. So, can you give me …

deeplearning learn managed maths nlp papers request research researcher research papers resources school