Morgan Stanley Quantitative Analyst interview questions

Applied online for campus program, attend school presentation and sign up for written exam. Exam was pretty hard is not prepared, question including math, programming and stochastic calculus. 1 month after the exam was contacted for an interview, which was scheduled 2 weeks later due to holiday season. Had first phone interview with someone sits in Mumbai at 2am EST. Another two phone interviews with teams at London and Hungary. Overall very technical and also focus on personality.