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Adjective vs. Adverb

The ACT typically has a question that asks you to choose between an adjective or adverb.  In the past, this has included the classic good vs. well question.  Once you know that good is the adjective and well is the adverb in this context (both can be other parts of speech), knowing the difference between an adjective and adverb is the key:

I have also seen some questions that have two words underlined when they precede a noun. 
The first word should be an adverb and the second an adjective, but the original text won't be correct.  You will have to pick the option that presents the correct lineup.

Adjectives modify nouns while

adverbs modify verbs, adjectives, and other adverbs.

Consequently, when you need to describe how you do something, an adverb question, choose well.  

I mow my lawn very well.  He writes well. 

To tell what kind of job you do, use good.

I do a good job when I mow my lawn. (Good modifies the noun job.)

Only when you're discussing your health does well become an adjective.  I am well (healthy).

The same rules apply to non-good/well questions. 

Find what the choice modifies.
If it modifies a noun, choose the adjective.
If it modifies a verb, choose the adverb.

Many adverbs are made by adding an -ly to an adjective.