Two tests: completely based on mathematical and logical aptitude.
Mainly CPI Based along with Resume selection and Aptitude Test for border cases. Cpi cut-off in the most cases were 9.

approximately 25 mins total time spent.
Asked about background(4-5 mins), interests(2-3 mins) ad plans for higher studies(2 mins). Then switched to describing about the company and querying about my knowledge about the company(8-10 mins). I had knowledge about the company work and work expected in detail and spent a lot of time on this. Then direct questions about stress handling(2 mins). Rest of the interview was me asking some questions to them.

if you are interestd in company work.......then only make a try...

My mathematical aptitude and genuine interest in company work. Also, prior information about the test structure, pattern and company information also helped me.