1. Practice identifying count and non-count nouns at learnenglishfeelgood.com.
Here is another exercise for recognizing count and non-count nouns:
2. With a plural count noun, we use many or a lot of.
With a non-count noun, we use much.
With a plural count noun, we use few.
With a non-count noun, we use little.
With these rules in mind, work on this exercise from Dave’s ESL Cafe
this exercise at EnglishExercises.org.