I have mild m.r, p.r and t.r. also mitral valves prolapse. can i take a ride in an amusement park?

Probably fine: Being on a thrill ride like a roller coaster can significantly raise your heart rate, which can be hazardous for those with tendencies to irregular heart rates or coronary artery disease, but the conditions you have are common and are unlikely to currently affect heart function. If you are able to handle exertion like exercise you should tolerate rides without any problems.