JackyP hello and congrats on receiving an invitation to the Mettl test for TMA., to be honest with you I did the tests a few years ago and personally I did not find them easy at all.
Psychometrics, Math Questions, Analyzing Data, Logical Puzzle questions, Cognitive ability, Questions in real-life situations (how will you react if your other flight crew member.... etc...
may I ask, what is your experience in seaplane operations?