if you graduate from west point what rank are you
Second lieutenant.
United States Military Academy
As all cadets are commissioned as second lieutenants upon graduation, military and leadership education is nested with academic instruction. 
wiki:19662514
United States Military Academy [SEP] Military
As all cadets are commissioned as second lieutenants upon graduation, military and leadership education is nested with academic instruction. Military training and discipline fall under the purview of the Office of the Commandant. Entering freshmen, or fourth class cadets, are referred to as New Cadets, and enter the academy on Reception Day or R-day, which marks the start of cadet basic training (CBT), known colloquially as Beast Barracks, or simply Beast. Most cadets consider Beast to be their most difficult time at the academy because of the transition from civilian to military life. Their second summer, cadets undergo cadet field training (CFT) at nearby Camp Buckner, where they train in more advanced field craft and military skills.