Yes, LA is definitely worth relearning. I had a great time writing it since it was a chance for me to review a lot of material. Even more fun was writing about the numerous applications, in the end about 1/3 of the book is on applications[0].

Before you commit to reading 500 pages of intense math, you could probably get a lot of reviewing done with the short tutorial on LA[1].

[0] https://minireference.com/blog/linear-algebra-book-alpha-rel... [1] http://minireference.com/static/tutorials/linear_algebra_in_...