i'm not good at the angles by any means but i can consistently get 9-10 on cdp by first looking at answer choices and comparing what's largest or smallest. then i do the "rapid glance" technique (some guy from sdn made it up) looking back and forth between the two angles as fast as you can creates a sort of "flip book", like a series of drawings on a stack of post-it notes. you can help differentiate between the two angles. if that doesn't help i move to the kaplan create a 90 or 180 degree complement/supplement angle and compare those. then if that dosnt work go with the one you think they are trying to trick you with. or just choose b