First round consists of multiple choice mental artihmetic. Since you arge given four options, it may be best to practice recognising correct answers rather than just calculating exact answers. Followed by tests on reaction time, similar to neurolympics.
Preguntas de entrevista [1]
Pregunta 1
Why would you like to work for optiver?
3*12/0.75 = 42/ 48/52/58