There is no reason to save time. Where are you going to spend it?
The process is part of life, not a distraction from life. You will not save time. Plus, you will be growing in other, social, emotional, spiritual, leadership ways. It’s not all about knowledge, but how you harness that knowledge in the company of others, that makes for a fulfilling life.
Here is a plan that works well: Shoot for going to community college through dual enrollment through high school. Also take as many AP exams as you feel comfortable with and score 4 or 5 on them. A community college will convert these to IGETC and pre-req satisfaction.
When college decision time comes, seriously consider community colleges. You may be able to attend community college for one year, finish IGETC AND all your pre-reqs, then transfer to Berkeley*. You will “save” a year that way; plus you will still save your parents 2 years’ tuition at UC AND one year’s tuition at community college AND have “the full high school experience.” In parallel, you can apply for scholarships at private universities.
Short answer: No, don’t leave high school- savor it!
Yes, aim for a scholarship and private university or community college and UC.
*If you really want to challenge yourself, you could figure out how to apply as a transfer student to UC and apply to community college over summer term after high school graduation. If you plan it right, you could conceivably require only a couple additional classes after high school to graduate full-IGETC from community college. Then, you would attend UC for 2 years and graduate. Because of logistics/bureaucracy this would, in practice, be almost impossible to do, but it is an interesting thought experiment. Each of these events (graduation from HS, matriculating to community college, graduation from community college) are supposed to be done sequentially, and to be complete by the end of spring term- but there may be some loophole depending on how the calendar lines up.