I wouldn't worry about the PSAT. It's only a practice exam for the actual SAT's. Even if you trip up on the actual SAT's, many colleges these days look at more then SAT and ACT scores.
They also look at your GPA and the types of courses you take. Are they academically challenging? Or are you taking easy classes so you can appear to be excelling all of your courses?
Try and work on your college admin essay on the basis of an earnest and original work of writing.
Colleges also look at levels of volunteering and after school activities (above and beyond sporting events) as well.