I'm about to start studying for the DATs and I would say that the top-front-end view portion is the second hardest portion of the PAT (the one where you take flat portions and make them 3D are the hardest). I don't know if you have taken a drafting class at any point during life (I have and it really helps, since you are basically drawing what you see in the questions), but what I can say is start from either the top or the end pictures. Try understanding what you are looking at and then use the front picture to formulate what is not given. Take advantage of the fact that you don't have rotate anything like the 2D to 3D formations.
I don't know if that is much help... I haven't started studying yet but I'll try helping once I do.