I don't really have anything to compare it too but I'll say this.
Collins test prep and the Pearson practice tests were the only thing I studied, and I didn't study very much. I did maybe 2-3 hours a week for about five weeks before the test and I got high 70's low 80's on every section. I'd say 4-5 of the Biology, and 2-3 of the Analogies were word for word the same with an additional 3-4 Sentence Completions/Analogies being synonymous with ones I studied.
The only thing I didn't spend a single minute studying was reading and i got a 40 (lol). Keep that in mind though. Obviously focus on Bio/Chem but study the rest of the sections equally because that 40 probably lowered my composite 3-5 points.
My advice, study the packets but recognize concepts from questions you missed, write them down and spend a bit of time in old books/notes to fully understand them. If you only focus on answers to specific questions you'll get a superficial understanding of the concepts you need to learn.