How feasible is it to refresh my math from algebra and then to learn calculus in one year after not touching math since high school?

The only one who can really answer this is you.  High School courses are typically designed to last about 10 months with 4 - 5 hours of classroom time per week.  If you review is going well, with studying 2 hours per day, it sounds like you should be able to do it.

I am doing the exact same thing at the moment, I’m 21 and haven’t done math since highschool but I’ve decided I want to pursue a degree in engineering. In the last month or so I’ve gotten through algebra basics, algebra 1, algebra 2, and am currently in geometry. I plan to also do the trig and pre calc course. I have to be able to test into a calculus 1 course by June so I will let you know how it goes.

Id also keep going back to the courses you’ve already been through on here and do some “mastery” problems or just some unit tests to keep your knowledge of it. Its working for me so far.

Michael Cesaro

That's good advice about refreshing by doing the master problems to keep you on your toes. I've also found this website called Prepform that provides good practice problems from Algebra 1 to Trig.

You're really breezing through everything! Are you doing each section or skipping some by doing the master questions at the end of the lesson?
Either way great progress and I believe that we got this!

I'm going through all of the sections, just because I worry that I'll end up skipping something I thought I knew better than I do. I'm also taking a lot of notes in my notebook. Writing things down helps me retain them better, and I can look back at stuff later if needed without having to find the lesson. That has been a huge help.

I don't know how much time you are looking to spend a day working on math, but I can tell you I've invested a significant chunk of time. Around 25 hours a week is what I've averaged. But I kind of have a time crunch, I'm in another "full-time" mechanics course right now and start taking CDL classes on the weekends in mid-June. So I need to have a majority of it done before then. If I could do it over a longer period of time, I would because I think it would have more time to sink in, and that's what's important.

Anyways, I'm with you, we got this. Just takes a little elbow grease.

Best of luck to you!!