According to your answer, it looks like you could use some help with Multiplying and Dividing Negative Fractions. We recommend starting with Volume 2 of the Learn Math Fast System. You'll learn how to add, subtract, multiply, and divide fractions with negative numbers, which is a very important skill to learn before starting pre-algebra.
RESULTS: End of 6th Grade Level, however, the Learn Math Fast System is for all ages. Volume 2 covers 4th - 6th grade topics, but there is no mention of grade level within the books.