I'm not trying to be mean or anything but I see questions like this all the time like 'can I get this grade..' or 'do you think it's possible for me to do well..?'
In my opinion it's just a bad question, who cares who people on average get? Who cares what other people think you'll get? I can guarantee it is possible for you to get those grades. Why do you need someone to tell you if they think you can?