JEE Main

There are three ways through which you can get admission in DA. One through the AIR of JEE Mains or if you are a Gujarat domicile, you can get in through ACPC through GUJCET. In case you are an NRI, or anyone of your parents are NRI you can apply for admission through your SAT score. There are no other entrances conducted by the college for the UG programme.
Hope this helps.

Yes, you can get B.Tech CSE in Amity, Noida as the eligibility is 60% marks (PCM and English) for general category candidates.
JEE mains: Students securing a score of 30 and above in JEE Mains 2017 plus 60% in E-PCM (English+ Physics+ Maths+ Chemistry/ Biology/Computer Science/ Biotechnology), will also be considered as eligible for direct admission process i.e., exempt from entrance test and interview for B.Tech programmes only.

DA-IICT offers admission to a student only through JEE All India Rank. So, I'm sorry you don't have a chance in DA where the last year's cut-off was around 12K and I have no clue about the admission system of the other institutes you have mentioned above.

It all depends on your AIR. Given that, you got 71% in JEE Mains, I am assuming you have a score of 255-256 which brings you a rank of around a maximum of 3K which means you have a guarantee to get in DA-IICT. The cut-off ranks are around 12K.
Hope this helps.

Hello Manoj G,
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Good luck.

Hello Piyush,
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Good luck.

Hello Sri Vyshnavi,
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Good luck.

Hello L Dinesh Kumar,
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Good luck.

Hello Priyanshu,
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Good luck.

Hello Naveen,
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Good luck.