So can someone help, I had a driving test today and was told to follow a sign, I approached a roundabout with two lane, and the markings said left and straight for first lane, and straight and right for the second. I was going straight so stayed in the right hand lane. When I crossed the roundabout it's onto a duel carriageway and has two lanes. I kept in the right hand lane as cars also joined in the left lane. It's up hill and merges at the top I remained in my lane until I saw a gap to move into. I got a major for staying in my lane and being undertaken. I feel I was slowing to find a gap to move across am I wrong for feeling hard done by here.