The 'free practice tests' problem nobody talks about

I'm going to say something unpopular. Most free practice tests are actively bad for your prep.

I know. I used them too. They're free, they exist, why not? Here's why not.

The first problem is calibration. A free practice test usually scrapes questions from forums or older exam dumps. The difficulty doesn't match the real exam. You'll either ace it and feel falsely confident, or bomb it and panic. Both are useless feedback.

The second problem is the explanations. Or rather, the lack of them. The free ones almost always say "the answer is C" without telling you why A, B, and D are wrong. And the "why the wrong ones are wrong" is where actual learning happens. If a test costs 0€ to make, the explanations cost 0€ of effort.

The third problem, and this one I only noticed recently, is that free question banks tend to overweight memorization and underweight reasoning. Real certification exams have moved toward scenarios. Free dumps are stuck in 2018.

This isn't an ad. I'm not selling anything. I just watched a friend fail her PMP in August because she'd done about 600 free questions and felt rock solid going in. The actual exam looked nothing like what she'd practiced.

What I do instead:

I pay for one good question bank per cert. Just one. Usually 30-50€. I do the same questions multiple times, paying attention to the explanations more than the score. I use the free ones as warm-up only. Like 10 minutes before bed when I don't want to do anything serious.

Free tests aren't worthless. They're just not the main course. Treat them like a snack and you'll be fine. Treat them like a meal and you'll be hungry on exam day.

By the way, the friend who failed PMP retook it 5 weeks later with a paid prep tool and passed. Same person, same brain, different inputs. Just saying.