The 4.0 unweighted is very impressive and though you do not list prior classes, it appears from current ones you likely have had plenty of rigor. MIT certainly seems possibly attainable, from what you have shared.
Just to confirm, are you currently a junior? What are your plans for the SAT this year? Did you take the PSAT in 10th and in 11th(last month)? What was your 10th PSAT score? I understand your 10th SAT was not really prepped–I am trying to get a better idea of your baseline.
There is no need to self-study APs: do something else with your free time.
What did you get on AP Euro?