Hello Sourabh Chavan

I would like to tell you that most of the IT company want the 60% over all criteria but there are some companies of them want 60% on B.Tech only and around 50% or 60% on the 12th and 10th (criteria as per mentioned by you)

Some company satisfying your mentioned criteria are
Mindfire
Wipro
IBM
Ericsson
DELL
HCL etc.

But if you are unable to get job in the big IT company like these, there is still nothing to worry about. You can try the other IT companies after gathering some experience on some field. Then you can apply for the post or vacancy in those big company. If you have experience then the education qualification merely matter. Your experience and work ability is what matters.

So as per my opinion, you must try these big IT company first then you can try the small company. After the experience you can apply the big company as i said before.

Hope it helps you.