[jimhefferon]

My Linear Algebra https://hefferon.net/linearalgebra/index.html comes with lots of exercises in each section, from easy to (a few) pretty hard. There is a book of worked solutions that covers all exercises. It is free so if you download it (and the solutions) and you find that it doesn't suit then no harm done.

There is no platform, no way of having the computer check your answers (if that is what you mean). For things like proofs, I don't think the technology can do that at this point.

[autoexec]

> It is free so if you download it (and the solutions) and you find that it doesn't suit then no harm done.

Not entirely free. It does seem to require you to give an email address to OpenIntro. I'm guessing they send a download link there, but the site does promise to spam you, keep your data indefinitely, and share (read sell) it if they decide that doing so furthers "the mission of OpenIntro"

[kirkules]

Your book has helped me understand determinants so much better than I had before. I really love its progression and depth, and I still have a lot more of it to get through. Thank you for making it easily available.

[jimhefferon]

You are welcome. I am glad you find it useful.

[srvmshr]

I am glad to find you here. I did do some practice problems on rusty topics from your textbook 2-3 years ago. Thanks for putting it together