Yea I'll say... Judging from the wear on the cap, and the around of feathers on the eagle (not on his wings but on his body) I am going to go with AU-54 But I am probably Wrong
Well, if he/she wants to learn grading the correct way, first it takes years and years and years. It's not something that can be learned easily . A Good start, would be registering for the ANA Grading Courses . These can be completed through correspondence and online. . That would be a good start.
And I've already pointed out to the OP it's not easy. We're doing fine helping the OP with the basics.