Not activated gifts – What to do?

You cannot.

EDIT: Okay, there is one way, delete these games from your account.

• games that cannot be verified... the games cannot be verified. They don't show as not activated, but as cannot be checked
• false positives... these don't count, because it's a known issue that they get flagged
• DLC cannot be checked

there's nothing wrong with those results

I checked with sgtools and you appeared green and fine for me. Those results are from "problems" with the checking system and not with you so there's nothing to worry about.

Your account is fine. Don't worry about it unless something comes up in red when you check.

It seems you are lucky as far as SGTOOLS go as "Its your last chance in new school" is a group/whitelist giveaway with multiple copies so it can't check if you received the game or not.
But you should try getting a key for the game or find a way to reactivate if you want to completely clean your account.

that game you removed may not be flagged by sgtools, but it's probably detectable by support.

if it was a single-copy ga you could ask the creator to delete it (with a bribe =3), but you still have 3 options:
- wait and see if you get suspended,
- get a copy and activate it, as suggested,
- contact the ga creator and ask to delete your win, but it may get ignored by support or take a long time.