The only college tutor I have ever thought was a good hairdresser got bullied out of her job by the other tutors because we started questioning their advice based on what this good tutor had told us.
There are some amazing tutors, but most of them are mediocre hairdressers who want to make money in the industry without having to improve their skills. I remember on my level 2, a new tutor trying to tell us that a sebacious cyst was the dermis, and that the dermis was a sebacious cyst and she went MAD at me for correcting her!
Colour touch with 12% is wrong because colour touch is not a permanent colour. Koleston can be mixed with 12%, but I still wouldn't have used it on her roots as 9% should've done the job nicely.