how do I learned math in 1½ months

I'm taking an exam in a month and a half. Here is an old copy: http://www.studyjapan.go.jp/en/toj/pdf/013e.pdf

This is a big problem because I didn't take Algebra II in high school :( How would I go about learning this kind of stuff on the internet in a month and a half (or what are my best chances)?

>>15
Wrong answer, according to Maple.