My 2 cents: I filter out GMATPrep, Kaplan,
MGMAT and "Other" sources in my app as I am using those for my preparation. That way when I practice in the app, I only see Knewton (mostly), Veritas, GMAT Pill, etc questions. You should consider setting the right filter in you app. Also in the forum, make sure you do not attempt questions from sources that you are using for your preparation - otherwise you will fine repeats in you CATs and trust me that's the worst feeling. I saw 2 repeat questions in my GMAT Prep verbal section, not sure from where, although I have never attempted any GMAT Prep question from anywhere before; I intentionally marked them wrong to not give myself any false sense of accomplishment.