Graduating a year early, when do I take the SAT / ACT?

Hello,

So, I decided to graduate early because I really can’t take any more classes at my school. I won’t have a senior year.

I’m currently in my sophomore year. I haven’t done anything for college or university admissions yet. I scored a 180 on my PSAT.

Right now I’m taking Calc BC. I’ve taken a junior level honors course for English some time ago. I have 5 APs that I’ve already taken, and I’ll have Chem and Calc BC done at the end of this year. But I haven’t done a single thing for college admissions yet. Haven’t applied for any scholarships, haven’t done any national tests, haven’t done anything other than clubs, extracurriculars, some courses at a community college, and the classes I’m in right now.

When do I take the PSAT, SAT, and ACT? What do I do to apply for scholarships and things like that? What should juniors have done by now to be prepared for college admission next year? How much should I be preparing for those 3 tests?