TIPS:

• Commas, apostrophes, colons, and semicolons are the most tested punctuation marks.

• ACT likes concise writing - the shortest way to write the answer is usually the correct way. 

• Not every underlined sentence/phrase is wrong - it's okay to choose "no change". This choice is right 25%-30% of the time. 

• "DELETE the underlined portion" is right 50% of the time. Concise writing is the goal! The shortest way to say something is usually going to be the correct answer. 

• Use the "graph-by-graph" method -- read the first paragraph, then answer all the questions in that paragraph. Avoid reading the whole passage first, to save time.