My spouse and I are currently both pursuing our undergraduate degrees. I'm double majoring in Computer Science & Mathematical Sciences and my spouse is double majoring in Economics & Finance. I have always had a very strong mathematical background prior to college. My spouse however, was not blessed with the same mathematical foundation.
My spouse will often seek my assistance solving algebraic expressions or transforming graphs. I'm happy to help but it troubles both my spouse and I that my spouse did not receive an adequate algebra education high school. There are noticeably troublesome short comings in my spouse's algebraic knowledge. My spouse is also aware of, and frustrated by, these short comings and has expressed a desire to learn what was not properly taught. My spouse did very well (B+) in the introductory college level calculus course, which proves to me that my spouse has a solid ability to learn mathematics when taught by a competent instructor.
While my situation is specific, my question is very general:
What is the best manner to assess a persons mathematical short comings and develop a specialized curriculum to remedy them? Are there any standardized reliable approaches/tests to determine which areas of algebra to focus on?