It was total 45 questions to be done within 45minutes. The questions were verbal non-verbal reasoning only. some mix of analytical abilities.

It was different from panel-to-panel. My panel told us to introduce ourselves and then asked what change would i do if i were to given 1 opportunity to change any past.

HR & Technical interview were parallel. Two panel were there, one asked HR question other technical. Technical question was basically from c, c++, sql

Just be confident what you say. be quick in reply.

The written test was conducted on one day in India so can't say exact no. how many appeared. in my college 350 approx appeared for written, 53 cleared then finally 17 selected.
Basics of programming language C, C , Database should be sound and last but not the least, confidence matters a lot.