Optiver Trainee Trader interview questions

CV and cover letter submitted online. Received a call the very next day to schedule a phone interview. The phone interview was super easy, it was just about my university experience. Following the phone interview got told to complete the mental maths test. I tried to practice online with this "trader mental maths" that was linked in an interview review on Glassdoor. However, the questions in the actual maths test were much much harder. I scraped through on the maths test (apparently they don't take anyone under 50/80). The next step was a skype interview, which was 50% behavioural and 50% the trader game test. The behavioural part of the interview was actually pretty similar to the phone interview, mostly about university and work experience, the trader game was easy, but hard to do under interview pressure. They called me a few days after the interview telling me that they weren't progressing with my application because I hadn't performed well enough in the trader game.

2 online numerical test, mainly mental tests and relatively easy compared to the industry average. Then HR interview within 1 week. No later interview arrangement then. Personally, I would say HR has too much power selecting a candidate as Optiver is a trading company, and the organization of HR department is...