Employment Bond for 2 years

Hi, all. I am an engineer who had joined a company in October, which has a bond for two years with a penalty pay of 3 lakh rupees. There wasn't any specialized training provided to me, only on the job training which was just overview of things and not much detailing. I now wish to leave the company since I want to remain in my core field and hence am planning a year drop to prepare for competitive exams. I would like to know about a few things as below: 1. The bond was made on stamp paper. It was signed initially by a notary. Is the bond still enforceable? 2. If I am not willing to pay the bond amount, will I be able to get experience letter for 5 months? 3. The probation period is 6 months as stated in offer letter, and there is two months notice period for resigning after probation is over, so will my experience letter not be given due to probation. 4. If the bond is enforceable, will I have to pay the full amount? 5. If they refuse to provide experience letter, can I take a legal action against them even if I break the bond? I desperately took the job initially because being a fresher I wanted to explore the field of work different from mine. But seeing lack of technical learning there I want to leave the job and take a drop to prepare for competitive exams. Hence please guide me how to proceed.