with a 50-60% score you are at risk of not passing the BCG Potential Test (the rumored score for McKinsey is 70% and the one for BCG Potential Test should be equivalent, once adapted for the fact that you have penalties in the test).
To improve your performance 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 (just google it). After that, Igotanoffer has several others you can purchase online
- Once completed the BCG test simulations, move to PST practice, as you have already started to do. 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 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.
- If possible, don’t print the sample tests; rather, do the simulations while at your computer. As it is a computer test, during the actual one you cannot write down notes near the questions and you will have to go back and forth to the different parts online; if you practice on the paper version only, you will find different dynamics the day of the interview which could influence your performance.
As additional notes:
- Calculators are generally not allowed, but there are exceptions in some countries (you can clarify that with HR).
- You have to take into account you get penalized for wrong answers, so you should adapt your strategy accordingly.
- Math practice, graph interpretation and quick reading training can also be useful. You can find some more comments on that at the following link: https://www.preplounge.com/en/consulting-forum/online-analytical-tests-483
Hope this helps,