I applied through my college. They conducted an aptitude test, and a considerable portion of the questions were number series. The difficulty level was quite high. Each section has its own cut-off.

Some questions I remember:

1. 7, -35, -34, -3, 15, 16, 4
2. -2, 7, -35, 7, 12, -60, 5, 10
3. 1.8, 3, 0.6, 2.5, 5, 0.5, 3.4, 2, 1.7, 4.8, 6
4. 0, 1, 2, 0.5, 2, 2, 2, 2, 4, 3, 2
5. -5, 1, -11, 23, 29, 17, -20, -14
6. 43, 4, 21, 59, 43, 3, 20, 66, 12, 2, 16
7. 8, 5, 9, 7, 2, 25, 5, 1, 16, 8, 6
8. 7776, 625, 64, 9,
9. 4, 2, 36, 4, 5, 1, 36, 16, 6, 3, 81,
10. 2/3, 5/3, 19/6, 31/6, 23/3, 32/3, 84/6,
11. 4, 11, 66, 74, 370, 379,
12. 2, 1/3, 2/3, 6, 7, 1/2, 7/2, 14, 20, 1/5, 4
13. 0.03, 0.0018, 0.00108, 0.00648, 0.3888

This series section made the difference in cracking the aptitude round.

Some interview questions:

• Introduce yourself.
• Why do you want to join IBM?
• Questions about Summer Training.

Introduce yourself.

Why do you want to join IBM?

Questions about Summer Training.