I'm not sure if there is such a place... but on the bright side, the grade is not that important.
Star rating (current quality) and potential (this can't be trained) are most important.
Grade rating is just slightly more exact star rating, but it doesn't tell the whole story anyway.
A player can have 5 stars (because of good basic skills for his position) and still have a poor combination of other skills or some very low skills which are slow to train.
So the grade rating is the last thing to worry about.
I always thought that Star Rating was a measure of both Potential and Grade Rating, combined. Meaning a 5 star player could have really good current skills but low potential, or really good potential but not so good starting skills, or anything in between.