First, whenever you get stuck with anything, the dedicated staff and members here at MHF will be willing to help you through thick and thin. Post your questions showing some effort (after all, in order to succeed, you need to do things yourself the first time... ). Don't be afraid to make a mistake on a problem; it is a part of the learning process. As we know, we learn through our mistakes...
Second, try to find online tutorials to help bring you up to speed on the topics you're struggling with. I would suggest looking through Paul's Online Math Notes for tutorials on Algebra, Calculus I, II, III and other topics. (I believe Paul covers precalculus in his algebra tutorial.) His algebra and trig review may be of use to you. Also, go to your local library and get books like "Precalculus for Dummies", etc. and look through them. Looking through additional textbooks may be useful as well.
I'll let others chime in and suggest things for you to do.
I hope this is enough to help you overcome the current struggles you have!!