how to increase my chances of getting a scholarship?Answered
private high school, increasing chances of scholarship
You can probably get a scholarship based on academics (for example, the link below has a few).
For financial aid, I doubt you would receive a scholarship since you go to a private school.
apply to safety schools—whatever ones those are based on your GPA, SATs, etc. you're going to get the most money from schools where you're in the top 10-20% of the students that get in, and that's usually safeties. if you have stronger stats, you'll have stronger safety schools.