Can't get onto T2 for candidate.
I was a bit confused with this too, but here it’s how it works:
The candidate trials (both) have a common tier. Your current tier is the last one you have completed (except in lv1, when you are naturally lv1).
Here’s an exapmple:
You have done T1-2-3 in Evon. You move on to Kiel. You current level in Kiel is therefore 3. You will get 4 options:
Let’s do that again! (t3)
Take it up a notch! (t4)
Take it down a notch (t2)
Take it doen 2 notches (t1)
Hope this helps.
Edit: You must do T1-2 first, onlye then can you do T3-4 – or so I read.