The list of countable nouns is probably HUGE and impossible to list. You simply need to be able to tell whether you can count the noun or not. Common sense prevails on this one.
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993