Your map is very impressive and I like the shape of your continents. Good Job with that!
The tectonic plates are overall good, but look at your continent on plate H. The mountain range there is young and ought to be on the border of the plate, but you placed it in the middle.
If it's an older mountain range, it should be shorter and less pronounced. I would do a quick check for this kind of things. The amount of plates is plausible (Earth has 15 major plates, you've got 16) and I like what you did on the border between C and D.

(Remember, I'm not an expert, but this is what I would do)