UBS Quantitative Analyst interview questions

Many types. First round: an algo in poker kind, exotic pricing, order book, internship Second round: linear regression, LASSO, ridge, PCA, VIF, an algo of prime number, brain teaser. Third round: linear regression, logistic regression, validation, some strange questions of matrix (forget most of them), many questions about internship. Introduction to the group. Forth round: English + Chinese, VaR, prob, option, class, etc. Fifth round: English + Chinese, career preference, internship, portfolio-related, index-related, etc. I guess last 2 rounds are from different teams and just try to allocate me. (But they may find it is so hard because I am not so qualified)