You should be proud of yourself.  You got very far on this test, farther than most, but the correct answer was downhill because the slope was a negative number.

The good news is that you can skip Volumes 1 and 2 of the Learn Math Fast System and start with Volume 3.  That book will teach you prealgebra in about a month.  If you only made a simple mistake and the last 10 problems were easy for you, you could probably start with volume 4.  Use coupon code PT2026 to get 10% off your order.