From a GED graduate at 35, I can tell you that it really is not as bad as it seems. I scared myself into thinking I would fail, but I actually passed! I then took my pre-admission test for college and passed all with 97% or better! Since then I graduated from Nursing school with a 3.85 GPA and am continuing my education. Believe me when I say, ANYTHING is possible.
However, Algebra was never my thing, and I don't know how you feel about it, but I bought the book "GED Mathematics by McGraw-Hills and it taught me everything in simple terms! I have kept the book to now help with my daughters homework as I am still no pro with numbers.
Believe in yourself, take the GED Classes or buy a study book and Good Luck!!!