Speed and accuracy was the prime factors of computer based test. Questions were mathematical and logical. No technical question related to Mechanical Engineering was asked.
Faster you solve, chances of selection is more.
Logical based and strategy based questions and puzzle were asked. Good basic knowledge of geometry is compulsory. The interviewer was interested in the fast thinking skills of candidate.
They try to learn you completely. Many different questions and normal questions (weakness, example of creativity, which behavior you do not like) were asked. Being honest and quick while answering will be enough for good results.