I am a student in Leeds Metropoliton University. My applaication to further leave to remain has been rejected?

I think the best thing to do is to appeal because making new application will take time and really either way it will be processed by the same people. Also your further leave to remain maybe declined if they feel that the grades you want are not achievable for you and with the changing immigration laws its better to get your application in and accepted because they change the laws and it becomes even harder.