Roger-Wilco
I did say "correct me if I am wrong", so thank you for the correction.
Re: your grouping of stages, ctc applicants do aptitude and group exercises in morning (some do aptitude first, some group exercise first) and only those who are successful that morning are asked to stay for afternoon interview. So maybe your stage 2, D1 and D2 are different for each fto? I should possibly have put stages 2a and 2b instead of Stages 2 and 3? I agree with your first and final stages. My equivalent to your final stage would have been labeled "stage 4".