This book is a really a reference text and should be seen as such. I'd say that it's aimed it at a high-level undergrad student in Physics or Maths who is focusing on applying mathematics to physical problems, and it should be seen as such. It covered pretty much every topic in my 4 year degree course in Theoretical Physics, and I used it as a reference text throughout my PhD. It is not likely to be a useful textbook to a student who struggles with mathematics; for that, you'd be better suited looking at Stroud's books for e.g.