I'm sorry you failed 3 times but there is no other way to get a license than to pass the test.
I failed once and then I took to driving classes (short course) just to know what they are looking for on the road test and also mainly because we do not have a lot of roundabouts back in our country. I found out that they are particular about your car's position before approaching a roundabout when you are going right, left or straight.
Try to go into a short course to bring up your confidence.