I don't have any easy way, so if anyone has any ideas I would also be eager to know.
I am a visual person, so what I do is write them all down and look for similarities. Like, normal values for potassium and albumin are similar, so I would group those together. Blood pH is 7.35 - 7.45, CO2 is 35 - 45, and Sodium is 135 - 145, so I always group those together.
Also, if I write them over and over again, I find that I can visualize the values and memorize them easier. You will have scratch paper or a dry erase board during NCLEX, so you can always jot down normal values when you get to the testing center.
My friend came up with a way to remember BUN which is 8 - 22. She says "Get your buns out of bed at 8:22." It's silly, but I will always remember the BUN normals.