AIG Catastrophe Modeling Analyst interview questions

From applying to getting offer letter it around 2 months. 1st round was aptitude test and 40 people appeared in it ..Subsequently for interview around 15 people were selected..Interview was of 2 rounds..Mostly they asked mathematical questions and puzzles .Which u can learn from any site

It was difficult and the written round was twisted. Took a while to receive an email from them regarding the written. The written and Inteviews were to be on the same day but was pushed. Took a week to get a mail for the interview round