Pls help

Hi, I have completed my Bachelor of Dental surgery in 2020 with 1 year internship from a govt medical College, as well as, I took my IELTS & achieved overall band 7. I have a plan to shift USA with student visa & then will try to crack the licence exam (although its hard to crack and need a huge amount of time & money, besides a huge uncertainty) just after completing the masters/Msc. Therefore, I need a suggestion from dear altruists, 1. What will be the suitable subjects for me if I want to run the life only depending on suggested masters/Msc ( as there is no guarantee that I could crack the licence exam)? 2.My brother is a green-card holder & doing govt job in USA. 2:1- Can he be my sponsor? 2:2- Does it cause any problem having a sibling in USA, while in interview? My preference : 1- Dental & oral health related subjects ( I have limitation on tuition budget) if budget exceeded then.. 2. Health related subjects. then... 3. MHA or MPH( as maximum of overseas doctor prefer this) please help me. thanks in advance. If any need any further information for helping me with that situations, please ask any questions. #health #dentistry #MPH #MHA #dental #oral #help #readytoapply