WorldQuant Quantitative Research interview questions

Online test for 1st round. I was given 40 mins for about 30 problems with strict time limit on each one. They are about probability, linear algebra, algorithms etc. Some of the problems are difficult and this is the most difficult online test I have ever experienced.

I have received a mail from a head-hunter. The job they offered was quantitative researcher. I have never learned about programming. I have only learned about using matlab and python. the process was Online test, phone interview and that was the end of mine. It took long than I have expected, but personally it was a good experience to learn more about quant.