The Math Death Spiral: How Knowledge Gaps Lead to Student Failure
justinmath.com
justinmath.com
Personally, I wish I had learned more of the greek alphabet in school. When I look at papers today I often get stuck on the symbols and my reading turns into "Where squiggly line is..."
Yeah, if you've got a deep hole in your knowledge, it can be difficult to know where the bottom is (which is problematic because that's where you have to start filling it in).