JEE

What is your name and where is your home state I don't know. You got 19k in JEE Mains paper 1. It is not a bad score for 2018. You will surely get NITS, no doubt about it. But, 70 percent marks in class 12th is arising question, so you may wait for JEE percentile.

If you have not appeared for CET or JEE, then you are not eligible for engineering admission.
But, if you have given either of them entrance exam, then irrespective of result you are welcome at our institute ICEM.

Yes, you are eligible through your marks. Though, I suggest you to check your eligibility through your board marks, as the minimum marks in most colleges in category students are around 65%, so there you can lack. Otherwise, you are clear. Best of luck.

For getting into a good NIT for general and with a good branch, the least you should have is 195. Below these marks are for category students to get admitted into. Best of luck.

Use JEE Mains College Predictor for Predicting the Colleges you can get based on your rank. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Enter your Rank and all details you will get to know colleges you can GET in which rounds and all. Good Luck.

Refer the following:
https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&grqid=vK1_IynE&s=1&hl=en-IN&geid=1031
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor

Yes, the minimum cutoff for AAT will be around 100 marks, hence you tend to be eligible for the examination.

Some suggestions be:
1- A Complete Self Study Guide for B.Arch. Entrance Examination by P K Mishra
2- Steps to Architecture NATA B.Arch. Entrance Exam Paper Guide Paperback by Nimish Madan
3- Steps to Architecture: B.Arch. (NATA/JEE Main) Exam Guide Paperback by Nimish Madan
4- NATA and B.Arch. Complete Self Study Material by Ar. Shadan Usmani

Yes, you can get into B.Arch with these marks into DY Patil School of Architecture.
Since, the cutoffs are dynamic and this data is based on 2016, so it may change and things may not turn in your favour. Although, your admission is more in your favour.

Yes, Vidyalankar Institute of Technology accepts JEE marks. You can show it for admissions.