Thanks for the feedback. I went back and reviewed groups 1 & 2 again. Finally figured out that the wording is what was throwing me off from identifying the SC and the NC. It's all good now.
Right, predicting answers really just means indentifying the flaw in the stimulus. Are you consistently analyzing the stimulus and identifying the flaw in the argument? This line of thinking is what will lead you to the correct answers.
Predicting (esp in NA and strengthen) is good but have MULTIPLE FLAWS in mind, cuz there are so many, and the answer WILL be the most obscure flaw in the hard ones.
For practice, if you are struggling at identifying the P and C, then I would do it until it becomes second nature. If you mean to use the method on test day, I tried it and it wasted some valuable time.