BHM

No, you need to give necessary test before joining.

You can get opportunities:
Avaition
Hotels
Cruise
Event management
Retail etc.

Yes, it is worth to pursue the BHM from Manipal WGSHA (welcome graduate school of Hotel Administration), because it is having good placements and good alumni network like Michellin, Star Chef Vikas Khanna.

After completing B.Sc from IHM, you can opt to either M.Sc or MBA.
Note: The IHM around India only provide B.Sc H&HA, not BHM.

Yes, you can earn money while studying for BHM degree, by doing various ODCs (outdoor caterings).

The difference between B.Sc and BHM are as follows:
B.Sc
1) It's a three year programme.
2) It has 4 months of internship.
3) It is mainly affiliated to NCHMCT.
4) B.Sc is mainly tutored by IHM around India.
BHM
1) It is a four year programme.
2) It has 6 months or 1 year internship.
3) It is mainly tutored by the private colleges.
4) Subjects are similar to B.Sc.

No, you cannot appear for government exams after completing BHM. You can appear for government exams by completing B.Sc H&HA.

No, IHM-Kolkata is not offering BHM degree. It is only offering B.Sc H&HA.

The BHM in Ocld is totally free and the students will be given stipend.

No, the job opportunities for BHM is not decreasing, it is increasing day to day.