Whatever your overall level is, nearly everyone has some holes in their math knowledge so it is certainly worth it for you to fill that gap!
Just an FYI, at Veritas we used to do an entire book that was the basics, but then we learned from student feedback that they wanted each lesson to be complete and to include the basics in the lesson so that a student went all the way from not knowing any fundamentals to facing problems above the 700-level in the same book.
So the newest version of the Veritas books contain "skillbuilders" with each lesson. For Geometry, Algebra and Arithmetic (including number properties) as well as word problems, and statistics and combinatorics, these skillbuilders are between 60 and 100 pages and include quizzes to make sure that you have the fundamentals. Then comes the lesson, which is heavy on strategy and application of the knowledge that you just learned; and, finally, an extensive homework section with original problems not references to the OG. Link to books at Amazon:
https://www.amazon.com/Veritas-Prep-Comp ... ritas+prep
If you do work with another set of books from another company I would recommend that you simulate the Veritas procedure by working with one part of the fundamentals(say geometry), then doing the lesson, and finally the homework on that subject.
