B.Tech Eligibility

You require at least 70% marks in PCM for JEE Exams and mostly all colleges take that score.

Basic Eligibility to pursue Bachelor of Technology [B.Tech] (Dairy Technology) is mentioned below. Please check for your eligibility from the criteria mentioned below:
In order to be eligible for taking admission in the course, one needs to clear the 10+2 examination with the combination of Physics, Chemistry, Biology and English. In certain institutes like National Dairy Research Institute, a minimum percentage requisite of 50% aggregate is required. Regards.

You can follow the link:
http://www.samundra.com/html/Applications/CombinedDNSandGMEApplication/application_Btech.html and apply online.

Yes, you can. Many countries and colleges will allow you to apply for B.Tech, but some colleges will allow you to apply for advanced diplomas or so. So, you should start checking college's websites for the requirements and email them also.