I took grade 11 accounting. It was great. Really easy course with very little work, in my opinion. Most of my friends felt the same. My accounting teacher said grade 12 accounting is largely the same, with a few key differences. I don't think you should take it in summer school. You'll want it during the school year to break up the day. Unless you desperately want to take so many courses you need to summer school something, keep it in day school. And it isn't really a bad course, it's especially good if you want to get into business. My teacher's daughter is in university studying business administration or something along those lines, and had to take an accounting course this year (her first year), and she said she was glad to have taken high school accounting, since they cover all of the high school curriculum in a matter of weeks, and since some people can't catch on to all of that in two weeks, their grade really suffers later on. I don't know for sure though, since that's just hearsay. I'd say at least take the grade 11, though. Try to make it in day school. You'll need to know how to do books at some point in your life, anyway.

Hope I could help.

Haha, sorry. I didn't mean to imply anything. I just mean you'll most likely have to know some basic bookkeeping skills at some point in your life. I don't know what they'd do in summer school. Honestly, I didn't know accounting was offered in summer school, since it isn't where I live. I'd still recommend trying to keep it in day school, unless you really, really want to do it during the summer. Where I live, a lot of people do grade 11 and 12 accounting back to back semesters in their grade 12 year since it isn't offered in the summer.