Dear Iranair,
That's most of the time the case on this site...
Despite the fact that there is nothing I can do for you about the CTC selection tests , I can at least tell you that it is worth joining Flydubai
You can compare with all the low cost carriers around ( in Europe at least ) and you will see that Flydubai is a nice company.
You will fly brand new B737-800 equipped with head up display , accars , the last Boeing sky interior , the brand new passenger entertainment system and soon the satcom system.
Of course , you will not be home and then need to be able to adapt to multi-cultural environment and that's where the problems start for quite a lot of foreigners joining.
If it is not done the way they were used to , it is not good and they start to complain...
Don't pay too much attention to the negative comments , keep your positive attitude and I wish you the best for the CTC selection...