Sorry to say but if you're a general or obc category student then you're not eligible to get admission based on your mains score card as you couldn't fulfil it's minimum percentage eligibility criteria. I would suggest you to rather take admission in any private engineering college or if you want admission into NITs only you can also apply for improvement but for that you need to wait for a year. The decision is yours. Though I think option 1 is best for you. To know any more details about admission ij any private college feel free to ask.

Thank you.

Hope it helps.