Is LOR and SOP is necessary for Pursue MS in Us?
SoPs are definitely necessary because most universities require that you submit them an SoP. A good strong SoP thta highlights all your research work and achievements in a good narrative style will definitely increase your chances at getting in a good BSchool.
On the other hand, LOR aren't a requisite but, having one increases your chance because it gives you an edge over other students!