the potential test is different from the McKinsey PST/SHL, although, as mentioned below, PST could still be a good practice.
For the preparation I would recommend the following:
- Practice as much as you can on Potential test simulations. You should be able to find online the Med-Lines case, either on a PrepLounge or on Scribd (just google that). After that, Igotanoffer has several others you can purchase online
- Once completed the BCG test simulations, move to PST practice. You can find a good number of PST test online for free. PST is different from the Potential test (the structure is not the same, in the Potential test you get penalized for wrong questions while in the McK PST you don’t, etc), but it is definitely closer to that than pure GMAT questions.
- Do all the simulations with a time constraint. Then, after each test, report all the mistakes you did in the test. You will likely find mistakes have something in common (eg, wrong math; too much time wasted on some questions; wrong interpretation of graph; etc). Then work on these categories one by one. Many people do these simulations concentrating only on the final score and don’t spend time categorizing the type of mistakes, thus not improving their performance.
Math practice, graph interpretation and quick reading training can also be useful. You can find some more comments on that at the following link:
Finally, you have to take into account you get penalized for wrong answers in the Potential test, so you should adapt your strategy accordingly.