Do you have any advice for me about school?

I am really stressed about school, I know that worrying does`nt cut it but I can`t help it. I don`t think I would be graduating high school. I have all the credits but can`t p the exit level TAKS. The majority of all of my friends did p, so what to I do? I hate worrying because that puts so much stress on me. Can you please help me relieve this stress?