Mumbai

You should be a graduate with minimum 2 to 3 years of work experience.
Below mentioned are the decent institutes:
1. JBIMS – Mumbai.
2. NL Dalmia - Mira Road.
3. NMIMS.
4. KJ Somaiya.
5. ADMI.
6. SIES.
7. Parle Tilak Vidya Mandir.
8. Welingkar.
9. Thakur College – Kandivli.
10. Chetna.
These are the institutes, in which you can get admission after a written test and a personal interview. Except for NMIMS, everywhere the course is of 3 years duration. In NMIMS, it is 15 months for executive MBA and 2 years for part time MBA.

You can go through GMAT previous year questions. You can also use CAT questions.
I hope it helps.

It depends on the exams, which you have given. But, you should go for SP Jain Institute of Management.

Following are the top 5 colleges for PGDM and MBA courses in Mumbai.
- Jamnalal Bajaj Institute of Management Studies
- Shailesh J. Mehta School of Management
- S. P. Jain Institute of Management and Research
- KJ Somaiya Institute Of Management Studies And Research
- Narsee Monjee Institute of Management Studies

Hi,
Following are the colleges for operations management course in Mumbai:
SP Jain Institute of Management Research
NITIE Mumbai
SJMSOM IIT Bombay
SIOM Nashik

Hi,
Following are the colleges for the same in Pune:
Fergusson College, Pune
MES Abasaheb Garware College, Pune
Symbiosis College of Arts and Commerce
Spicer Memorial College
Yaswantrao Mohit
Following are the colleges for the same in Mumbai:
Asmita College
B Amlani
Bhavans College
Guru Nanak
ICLES
Jai Hind
KES Shorff

The best colleges for Master's in advertising in Mumbai are:
1. Amity School of Communication
2. School of Broadcasting & Communication
3. Pearl Academy
4. Deviprasad Goenka Management College Of Media Studies
5. K C College of Management Studies

Yes, you can take admission for degree in mechanical engineering in Mumbai through lateral entry program. You have to give exams and fill up the forms to get admission.