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If you're interested in automobile engineering then you can opt for diploma in automobile engineering, depending upon the norms of the colleges the admission process can be merit based or done through entrance test as there are many state level exams. generally speaking the eligibility criteria is passed class 10th from a recognized board with Mathematics and Science securing 50% aggregate, BTech won't be possible in your case you haven't studied PCM at 10+2 level which is imperative for bachelor degree in engineering, explore more information regarding automobile engineering at https://www.careers360.com/courses/automobile-engineering-course , also check out the entire list of colleges offering the course at https://engineering.careers360.com/colleges/list-of-diploma-in-automobile-engineering-colleges-in-india