Less than 60% in 12th, but 75% in graduation - can I get IT job?

You can get a job, for sure. However - you will have to look for IT companies that do not require the greater than 60% criteria throughout. That's okay, because you can start your career with a small company and then work your way up.

Look for smaller companies in your city and apply to them. You should have a strong skill-set and sound knowledge of programming languages. I'll recommend getting certification in the technology / language of your choice to enhance your chances of getting recruited. 

Hope this helps. If you have further questions, ask them below.