Netter's helpful for developing a mental picture, but the drawings are too unlike an actual cadaver to be much help with the practical exam. I have Moore, Rohen and Netter. I use Moore and Netter to work through clinical problems, and to prepare for class and PBLs. I also use Netter for comparison to our cadaver in lab. But I use Rohen to study for the practical.
The official class text is Snell. I bought it, compared it to Moore, and promptly returned it. It weighed less, but that was really the only point in its favor.
Also, I find it helpful to draw pictures and diagrams. I resisted doing that, initially, but anatomy is such a visual subject, you almost HAVE to learn it that way. I'm not a good artist, though, so usually I'm the only one who can recognize what I've drawn. But that's all that counts.
And the other thing is, I find it completely worthless to study using study aids someone else has prepared. I have to sort through the material and make sense of it myself, or it just doesn't stick. Mnemonics are pretty useless to me too. Uses up twice as many neurons, because you have to remember the mnemonic, and then remember what it stands for. Much easier just to learn the material. There are simply no shortcuts, and that's why anatomy sucks.