Help.

Dear /sci/
I used to be quite good in math and shit back in high school, I've been working for 5 years now, and my math skills are almost dead, all I can do now is additions, subtractions and multiplications. I don't need math for my work, but I don't want to remain at the math level of a 10 year old kid for the rest of my life.
Are there any good books or methods to regain my knowledge /sci/?
Love, anonymous.

If your looking for the best way to sharpen your math skills quickly, I suggest getting The Heritage Guide to the Constitution.