I am from india , international medical graduate from rep. Of belarus . I gave usmle step 1 exam and then applied under b1/b2 visa for step 2 cs exam , but i was refuse under 214(b) in new delhi . Now i planing to study cardiology in belarus again . I want to apply us visitor visa after one month after starting study in warsaw . My sister is us citizen . How much possibility of getting visa this time ????