TEF - French Exam

Has anyone taken the TEF i.e. the French exam for Express Entry? Am curious about your experience in terms of how hard/easy it was, how you prepared, any tips etc.

While I’ve not personally taken the TEF, I’ve friends who have compared the difficulty of the TEF to be comparable to the difficulty of the DELF B2 exam.

Seems to be reasonable as a comparison since DELF B2/C1 are typically the level where one starts having the vocabulary and gmatical range that are similar to a more native speaker.