I am sorry I cannot answer all of your questions. What I do know is that accommodation is not provided. At grade 17, official car and driver is granted if your post is such that a car is needed to perform your functions. NH&MP has its own medical establishment and you and your family are entitled there totally free of cost. Also if you get treatment from a hospital (other than NH&MP's dispensaries), you will be reimbursed for the bill. Salaries are better than other ministries and departments (don't know the exact) but yes, promotion is an issue!

And as bliss said, you will be fortunate if you get selected there. All the best!