WHU INTERVIEW HELP

Hey , Could'nt find any specific thread related to WHU- Otto beisheim school of management application process. So , Thought of starting one.
I had submitted my application for WHU- MIM program Germany and have qualified the application round. Now i have received a call for admission test that will be held online in first week of may,2019. The admission test is divided into 3 parts. First, We need to prepare a 15 minute presentation on the topic and there will be discussion related to it after the presentation. The topic will selected by the admission committee and we will be receiving information related to it one week before the test day. Second, There will be a one on one interview with the panel which covers almost everything related to your resume, motivation , decision of study, experiences etc. Third, There will be a 45 minute interview in which applicants will be presented with brain teaser questions while being observed by an examiner. If someone has already been admitted in WHU MIM program, Please share your test day experience and tips ofcourse. I don't understand how will the third task be like, What kind of questions will be asked in brain teaser interview? I am really very concerned about the admission test day, Please Help so that i can turn my call into admit.
I will be taking the interviews on skype . Any indian student with a admit for 2019 intake? Please shed some light on your personal experience.

Thankyou in advance.

Abhinav.