I had the same problem (still do with pharm r/t all the different meds out there). I googled normal lab values, found several different lists and made an 'average' that was easy to remember for me so that I would recognize something out of the norm on the test (i.e. Ph is constant 7.35-7.45 so... PaCO2 35-45; Hct 35-45; Na+ 135-145 etc. Some are actual other's I've averaged out, but all allow me to see when a lab is off. Usually knowing the 'general range' will let you 'see' the abnormal result. For the NCLEX it allowed me to use the process of elimination. See the one's I know are right, keep or remove depending on what the question is asking. It truly helped me!
Hope that helps. I am currently working on trying to figure out what meds I should really focus on. I just wish the NCLEX would tell us 'why' someone is on a med every time or list the meds as ACE inhibitors or Beta Blockers
instead of just giving the name of the med in the question as it seems to like to do. That would certainly help!