Don’t misunderstand me. I think it great that you did really well in one of your classes. You should be proud of yourself. But in the world of college admissions, there is no such thing as an A+.
The highest grade available on a 4.0 scale is an A. Not an A+. Why? Because an A grade says you did as well as you possibly could. You can’t do any better. That is why the vast majority of high schools in this country do not give any grade higher than an A.
Sure, colleges will see that your transcript says that you received an A+ but they will convert that to a regular A for purposes of making admissions decisions.
If your high school has an A+ as the highest grade in a class then by all means shoot for that grade. But understand that when colleges see that, it is a regular A.