JEE Main

Udit I feel dropping an year is not a good idea. What if you don't get good marks or even this much of marks next year. Better would be go for admission this year only. If you are not able to get admission in a good govt.institute with these marks, these marks can get you good private universities.
These days even private universities are imparting quality education to the students around the world. They offer you admission on JEE scores/ tests conducted by them/ your marks in 12th. Some of these also offer good scholarships based on any one of the above mentioned admission criteria.
Good luck.

many good B.Tech colleges organizes their own entrance exams like srm, vit,kiit etc. according to times of India survey, srm is the no.1 B.Tech college in 2016. so u can join there.

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Never. NITs offer seat for qualified students in JEE Mains. bt if u interested in engineering this year then u can get pvt colleges. OK

IIIT Allahabad Admission Process is opening. just search on Google.

Chances is very low. u can get top pvt colleges. I.e. TECHNO INDIA, HALDIA, HARITAGE, PEC, FITU, many more

yes you will get CSE stay positive.

The list of DGS approved colleges is here, check their eligibility and select.
http://www.dgshipping.gov.in/Content/PageUrl.aspx?page_name=ListofallapprovedTrainingInstitutes

75% is not a criteria. There is a cutoff which is changed every time depending on the difficulty of the paper. Students who qualify are eligible for giving JEE-advance.