IBM Software Developer interview questions

First there was a written test, which had apti n mahematical questions and there was a different section on computer science which comprised of data structures and algo. Then after shortlisting, 1st rounf of tech interview. 1. Serialization in Java. 2. Life cycle of a servlet. 3.Synchronization in Java. 4. XML related questions. Could answer almost all of them. Then was a managerial round followed by HR and offer.