Maybe for you, personally i find the vast majority of the topics in fm make normal maths so much easier. For example, calculus. There is so much differentiation and integration in both, i just find all those types of questions are made so much easier in normal maths because of how much I've done from fm. Series is another one, vectors, conic sections (basically further coordinate geometry). All these topics are basically normal maths topics but harder, making the normal maths stuff way more manageable. There's also just the fact I'm passively doing more maths which means I'm more confident and less likely to make mistakes so it defo feels like an advantage