NMAT

I would suggest you to reappear next year. With this score you will not get into a decent college.

Yes, you can try in Amity if not on NMAT basis you can give Amity entrance test but you have to fill the Amity registration form from its site:www.amity.edu
Entrance test will be followed by an interview .
But first, you fill the registration form.

IBS, Hyderabad and NMIMS, Hyderabad are only two options where you have chances to get into with your NMAT scores.
Check other colleges accepting NMAT below.
https://www.shiksha.com/mba/ranking/top-mba-colleges-india-accepting-nmat-by-gmac/2-2-0-0-3275

Yes, you can. Apart from Amity, other colleges that you can get with this score:
Chitkara University,
SRM,
VIT Vellore,
IBS,
UPES,and
Thapar University.

No, ITM does not accept NMAT scores.

1. Chitkara University.
2. SRM.
3. VIT – Vellore.
4. UPES.
5. IBS.

1. Chitkara University.
2. SRM.
3. VIT – Vellore.
4. UPES.

Based on your CAT score, you can apply for-
Apeejay School of Management
ITM Navi Mumbai
Amrita Institute, Coimbatore
IMDR, Pune
IIFM, Bhopal
School of Communication and Management Studies (SCMS), Cochin
BIMTECH, Greater Noida
N L Dalmia (PGDM), Mumbai
SIES, Mumbai
Indira Institute, Pune
Alliance, Bangalore
Pondicherry Central University (PCU), Puducherry
Auro University, Surat
Indian School Of Mines, Dhanbad
SDMIMD, Mysore
Christ, Bangalore
Welingkar, Mumbai
IMT Nagpur, Nagpur
Kirloskar - KIAMS, Karnataka

You need to try to score above 200 so that it will be easy to get into here,otherwise with 184 it's tough.

There is no quota system at NMIMS. At 179 the chances of clearing the cut-off is zero. If you have applied for pharma program, you may clear the cut-off as it is usually around 175.