No college requires both the SAT and ACT for admissions so if you did well on the PSAT, then I would concentrate on that test only. @bjkmom gives great advice and I would try to get all your testing done by Fall Senior year so at you have a good list of target schools based on your scores and you can concentrate on other aspects of the applications.
For the California public schools, the Cal states will superscore while the UC’s will take the highest score from a single sitting. Having at least 2 test scores is advantageous for the super scoring. For other schools, you need to check the websites and see if they superscore. Also take the SAT and ACT with the essay since the UC’s do not consider any scores without the essay. Cal States do not require the essay and again other schools such as privates will have that information on their websites.
How did you do on the PSAT?