Absolutely. Seems like there is only upside for taking them again. After a few more hs courses and maybe a little test prep he might go up a little. Every point might mean money in your pocket in the form of academic scholarship.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .