Play interview-prep games. Short, timed challenges that sharpen memory, pattern recognition, and quant intuition.
A simulation of Optiver's Code Compare interview challenge meant to test your memory and reaction time. You'll be shown progressively longer and more complex strings. Your goal is to remember what you just saw, and recall it correctly before time runs out.
Practice Optiver's 80 in 8 with a shortened 50 in 5 - fifty math problems in five minutes. Test your mental math skills, and see where you rank relative to your combination. How sharp are you really?