Urgent help needed, AP Comp Sci in 20 days

<p>So, because I had my high school exams till today, I was focusing 100% on my high school exam. I stopped preparing for AP Comp Sci for a month. THE TEST IS IN 20 DAYS. ITS ON MAY 6th. I am getting panicked.</p>

<p>I have been studying Java using a textbook (A guide to programming in Java by Beth Brown) for about 6 months. (2 hrs a week)</p>

<p>I know these topics:</p>

<p>Packages, Classes, operators, IO, objects, inheritance and polymorphism, array, a little sorting & searching</p>

<p>This is what I don't know:
The wrapper class, math class, program design and analysis (SDLC, waterfall model etc.), lists, recursion, sorting (not confident), GRIDWORLD STUDY.</p>

<p>I haven't done any practice AP Comp Sci exams yet.</p>

<p>Do I still have a chance at getting a 4 or 5? I have 20 days to learn and practice. Is it possible or am I being impractical?</p>

<p>Any tips?</p>