There was effectively nothing about linear algebra on that page. After some link followings, it appears that http://www.scotthyoung.com/mit/1806-exam.pdf is the exam which the student was happy with (having done worse on the first version). The final score appears to be 66 out of 100.
Based on that test, I think the title is link-bait as it isn't "mastering linear algebra" but "passing an introductory algebra course."
Based on that test, I think the title is link-bait as it isn't "mastering linear algebra" but "passing an introductory algebra course."