Teach For All interview questions

I had 4 rounds of interviews ( 1 with a panel of 3) which took me hours and days to prepare for each. I also completed a written assignment where I wrote out a proposal on how to evaluate one of their programmes and created a draft theory of change, all this took me about 5 days to complete (they say it should not take you more than afew hours but that is never the case). I also submitted a written sample of my previous research. It seemed to be going positively until I got the email that they decided to go in a differerent direction.