Only remark if you really really think it will change. I remember I had an exam remarked last year following the insistence of my teacher, was only 3 ums (1-2 raw marks) off the grade above so I thought why not... It never changed.
Think about whether it will be worth it money-wise. If it doesn't change you'll just have wasted a lot of money for no reason. (I was lucky cause my school paid for mine)