A motivated student with strong number sense and willingness to work at it diligently ought to be able knock out a year's worth of curriculum in any of these topics in 10 or 12 weeks, but you have to stay on it.Take the advice of a good teacher if you have one, but don't despair if you don't have one.We make a LOT of changes, and rapidly, in those first years out of high school.
There is a HUGE difference between most 17 & 18 year olds, and most people in (even) their early 20s.
Why would it be weird for an 18 year old and 20 year old to date?
Do you think it is possible to cover Algebra 2 in 3 or so months with a really good teacher?
(EG Prep school teacher) Generally 8th Grade is "Pre-Algebra", but you should already be able to do simple algebraic tasks such as factoring monomials and solving linear equations by the end of 7th grade.
Girls who had been manipulated by older boys would often come to me years later and ask me to help them get their GED by giving them free private math lessons, but I was raising my family and didn’t have time to give them free lessons.