Hi anupampaul538,

First of all a hearty congratulation to you for your result and passing with flying colours. Coming to your question to get eligible for engineering courses you have to pass your 12th board with Physics,Chemistry and Maths securing of minimum 75%.You can appear for neet  and try to secure a seat in medical courses as mathematics is not compulsory there.If your desired is to study engineering then kindly wait this year and try to appear for CBSE improvement exam next year. For more details on this exam you can check CBSE official website.Just remember there is 'always a next time' don't lose hope, be a hustler,Chase the excellence and success will chase you,just to motivate yourself:)

Wish you a good luck for your coming future!