I wouldn’t self study anything unless it’s not offered at your school, and it is something you are really interested in–like your potential major. Otherwise I suspect admissions officers will just roll their eyes. I would. Your selection of “easy” APs does not inspire confidence…
Looking at this another way, my kid self-studied Physics C in the spring of her senior year. Why? Because she had time then, she wanted to learn it and our school doesn’t offer it. Ask yourself, would you still do this as a second semester senior, knowing that it would not appear on your application? Or are you resume padding?
You say your school offers many AP classes. What’s wrong with taking them?