Can we directly compare the result of PTE12 with the results from the PTE11 taken in the autumn?

Yes, if the transition test is not administered progress will be measured from PTE11 to PTE12 (the same applies for PTM).

Which levels do I buy for the new series?

You can find out the levels on the individual product pages for PTE:

Can all tests be delivered in paper versions?

Yes, paper and digital for all levels up to 14 and the Transition Test. However, for Level 15, there is no paper test, only digital.