Yes I think it is enough. I took the practice exam 2 days prior and got a lousy score! I have to confess it was harder than the real exam. But the book basically explains how to work every problem and gives a good amount of examples for each.
The reading was rather easy, but then again I am a bookworm and always have been. If you aren't used to reading a lot of literature or essays, then it might be a challenge and therefore, you should concentrate at least a week on that alone.
It is kind of like Sparknotes questions. There are like 3 or 4 questions per essay/short story. It might ask you for the main idea, supporting details, thesis, etc. It might include questions like "Who was the main character", "What was implied when the person said thus and thus", etc. Basically, you can look online for reading comprehension worksheets. There are many that are very similar.
, know how to:
-spell words easily confused like judgment, receipt, embarrassed, etc;
-difference between its and it's;
-where to put semicolons, colons, hyphens;
-be able to identify mistakes in a sentence
-know difference between common and proper nouns
Basically grade-school stuff. The practice tests at the end of the book and the one on the ATI site give you a good idea of what will be on the exam. Good luck.