Dear Praveen, first things first, to study Medicine abroad, you  need to qualify in NEET. And your board exams only can determine your eligibility of appearing in NEET. But once you appear in NEET, if you belong to General Category, you should score 50% or if you belong to SC,ST,OBC you shpuld score 40%. This 50% and 40% is out of top NEET score. Once you qualify in NEET, you technically become eligible to apply for studying Medicine abroad. Now every foreign Medical University has its own requirement. For example, Germany only accepts meritorious students. So you have to check the official website of the University that you want to apply for what their Boards marks requirement might be.