Congratulations on your achievements.
What is your unweighted GPA? Calculate that yourself, using any A=4, any B=3, and so on, core courses only.
What does ‘skipped geometry over the summer’ mean? The UCs will require geometry on your transcript.
UIUC CS has about a 6% acceptance rate, so that is a high reach. OOS COA at UIUC is in the high $50Ks, and international students don’t receive much scholarship aid at all. Is that affordable for your family? If you don’t know, talk with your parents and get a firm budget.
Your entire list is reachy (many of these schools have international acceptance rates below 5%). Purdue the most likely, I would call it a match/target. The rest are reaches. As of right now you would not submit your 1370 to any of the schools on your list, except Purdue, where it’s required.
You need some target schools and at least one affordable safety. When we know your budget and whether you will qualify for need based aid, posters can better help you.
Run each school’s net price calculator (linked on their websites), even though they really aren’t set up for international students you should get a sense if you will qualify for need based aid. The public schools on your list are unlikely to give you any financial aid. What Canadian schools do you have on your list? Why no schools in other countries?
Scholarships of significant value for 4 years of college tend to be highly competitive with difficult applications…I would not count on this to significantly decrease your college costs. With that said, of course you should try but college apps/essays take priority over the scholarship apps/essays.
Do you want to do this? It doesn’t really sound like it, and no, it will likely not increase your chances at any school. If your counselor says it will (something you will have done for 5 months max prior to sending out apps), disregard that advice.
ETA: I would not drop foreign language and social studies your senior year.