I've read all the postings from the last window and these 2 chapters are 70% of the test.  IT is 25%.  You still have time to move the test date out.  You have chapters 1,2, and 4 done - but that is only 30% of the test. 

If you have to sit for the test, at least get a Wiley book and go over the cost accounting section.  Do all the problems, then go back to Becker.  That got me through chapter 3.  Today I bought the Yaeger BEC section to get me through the cost accounting.

I found that if I know the formulas well, I can get through the questions without doing a Kamikaze Death Spiral.  Make a cheat sheet of all the formulas and memorize them.  It gives you a place to start for the math problems, and 1/2 of the concept questions can be answered/guessed correctly if you know the formulas well.