If you are concerned on your natural skills etc, I would recommend getting a an independent assessment.
Don't take it that just because CTC wings said they believe you are not right you should give up all hope. They're also assessing whether you're the type of person who can succeed on their course. Which not everybody is.
I know a guy who failed the assessment at Oxford Aviation, and who is now a easyjet captain. Also one of my close friends who has represented Britain Internationally in aerobatic competitions was also rejected from Oxford and was told he would struggle. He now has an ATPL and a job.
They didn't tell you to give up and never go near a cockpit ever. They invited you back so therefore probably believe you have the potential but just you weren't up to the current standard.
If you are not right for CTC then move on, go modular or look at some other integrated programs. Just don't think that it's over because one school say no.
Gapan have assessments every few months that are non-biased, here is the link:
Aptitude Tests - GAPAN
Goodluck