NATA

Yes, NATA is also related to B.Arch paper. It will be for 1 year entrance in any colleges.

Yes, its better to write NATA test along with B.Arch. It will be an opportunity for 1 year architecture in any college.

No, its better to go to Dubai for paper 2 in JEE Mains after scoring high rank.

The NATA cut-off is 40% (minimum) to be eligible for B.Arch.

Yes, you will be able to apply to IPU. But don't get stick to IPU. Only apply for other universities also where you can get better colleges than IPU.

NATA is the main examination via which you will be able to secure admission in a college of repute for a course in architecture. So, if you are looking for admission in an architectural course you should re appear for the NATA. However, there are other exams you can opt for, names of which I have mentioned below:
Entrance exams:
NATA
Full Name: National Aptitude test in Architecture.
JEE Mains Paper 2
Full Name: Joint Entrance Exam.
AMU B.Arch Exam
Full Name: AMU B.Arch entrance exam.
KCET for Architecture.
Regards.

There is nothing you can do now. The only thing that you can probably try is to get in touch with college authorities and get your details corrected.

Previous Years Cut Off
Here we have mentioned the previous year qualifying cut off for NATA examination:
ExaminationMinimum PercentageTotal Marks
MCQ sectionAt least 25% (total 30 marks)120
Drawing sectionAt least 25% (total 20 marks)80
Qualifying exam50% marks

Hi,
The Final Merit score is calculated based on your 12th board exam percentage and your NATA score. Just divide your NATA score by 2 and add your board percentage (which is out of 100) and then divide the total by 2. That gives you your final merit score.

Level of Maths in the NATA exam is moderate and the syllabus is generally of metric level.