Graduate Trader

1) Around 50 tough questions in 10 minutes. Its much tougher than what you might get at Optiver screening. Thus need not complete all. No calculator allowed but you may find your ways. But have to have speedy calculations. I did around 35 with around 95% perfection. So around 33 got me interview.
2) HR Screening: To just talk about your motivation and see if your mental math is really what you claim and not just calculator usage. Question like: 8/17 till 4th precision. Follow up question tell me now 5th decimal along with previous 4. That means memory + precision. Now asked my confidence on answer if I was willing to gamble my interview result on that?. I was almost sure so I bet 99.5% percent and yes for interview. Indeed I was right. Rest was general Family background or even getting to know how you are as a person. Be frank and if coming from humble background speak it up. No worries. They love it.
3) 1 on 1 with head of quant(TJ): Multiple estimations, market making questions. Asked about open position and PnL. I talked about my love and mastery over Chess. Next MM question was Total number of moves played from both sides in last GM championship Vishy Anand vs Magnus. 11 games in total so made markets. He provided newer info 2 times about game 1 and 2 moves and checked my market. Question 2: 4 Cards(2 Red + 2 Black). Bet money on four outcomes of card picking at random one by one. Different scenarios: Bet on 1 = Red. Opposite info for 1 given(Black). Now bet on 2 = Red. I went on Variance minimizing strategy which is I think perfect. But my mistake was when I was provided 4:1 Margin I changed it to Mean maximizing strategy under pressure and improper calculations.
So I believe MM and betting errors were problem for me for not getting to next round.

But their procedure is well defined and good.