I remember when you first posted this and it is a project I think upon very frequently! It's nice to see you have made further progress — and that there are comments with attempts at solving! Great job.

I still find some problems with the navigation of the problems, but I am not even sure where to go to fix that. It has to do with the difficulty of each problem, but also with how large each topic is: algebra encompasses both linear algebra and linear equation solving, which is a very wide bracket.

But you're making progress. That's great! Congratulations on that, and I'll be sure to keep visiting the website.