Ch 7: All Chapter
Ch 8: All Chapter
Ch 9: pp 159 - pp 172 (until Equilibrium GDP). The last section from pp 172 to 176 is also important for you to read. It is difficult to understand well but I'd like you to try.
Ch 10: pp 182 - 196 (until Applications of the Model)
Ch 11: The entire chapter (everything is important)
Ch 12: The entire chapter (everything up to Supply Side Economics is important. The last section on Supply side economics is less important. You should still read it.)