I used 5 paragraphs, planned out the 3 body paragraphs by scribbling down ideas for 5 minutes like Kaplan suggests, and picking the best 3 ideas for solving the Pcat's "problem" like global warming or racial intolerance or whatever they throw at you.
1st paragraph: 2 sentences. Sentence 1 restates the problem. Sentence 2 gives a preview of 3 workable solutions.
Each body paragraph suggests a solution. In at least ONE of them, bring up a commonly-stated alternative idea & explain how it's a bad idea, how your idea is better. Say it as if it is just obvious.
Last paragraph restates the problem but says that it can be overcome using a combination of idea1, idea2 and idea3.
Try to do like a newspaper reporter & not use the same word too many times. Use synonyms. Use a person's full name one time and just Dr. Jones or Mr. Brown in other places, stuff like that.
Bring a big eraser with you so you can remove entire sentences in 3 seconds. Anything that is repetitive should get erased.
Look at how much paper they give you to write on. Then look again after you've finished 2 paragraphs. I used about 3/4 of the paper they give you. If it looks like it will be a squeeze, start writing smaller.
I got 4.0/4.0. No idea how to get a 5 unless I can research a subject, cite sources, spend 3 days working on it...
If you get the feeling you are pulling statements out of your butt, that is normal, continue writing. You only have 30 minutes & a pencil.