To your first question, you can simply go to the hospital and ask for sputum tb test screening to be done for the purpose! Need to collect two sputum samples for the test and I think you can get it done easily. Its not much expensive and can be done in few hundreds, but we dont know the exact charge of the hospital. For the second question, you need to do PCR test for the COVID 19 test and three hospitals, Teaching hospital, Bir Hospital and Patan Hospital are only the authorized hospital for the sample collection and test of the COVID 19 in Kathmandu currently! You can go there and have the test for Rs 5500 as said by government! Hope this solves your query!