Old Age Setting in

How is it that I graduated from high school but yet can't remember a lot of what I learned? I am getting ready to take my college placement tests next week and I am amazed at how much I have forgotten. It has been 17 years but still! I need to do some review so I don't totally bomb. Remedial Classes here I come!! I am so determined to do this and to fulfill my dreams. I am so afraid of failing. Worst case senario is that I don't do well in math and can't get into the nursing program. I do have a backup career. I at least want to try. Hopefully , now that I am older I can be more focused then I was in high school.
I can do ALLTHINGS through Christ who gives me strength!!!!