As a reminder, GMAT focus has not really added any new questions or information to the test. It actually removed it. The focus edition removed the essay, the grammar portion which is the entire sentence correction question type and the geometry topic from the quantitative review. The only material change at this point are the data insights questions if in the past most people ignored it, now you have to prepare for it and practice these question types.
As the result, while still quite a disruptive event for many test prep providers, who had to modify their courses, update practice tests and so on. But GMAT focus was more about deleting content rather than building it up.
I would say the prerequisites would be the same as for gmat classic:
1) a good command of English language if you’re not a native speaker.
2) You should also have an average math understanding. If you are very rusty or you decided to declare yourself as a non-math person and have a defeatist attitude during high school and college, you will need to catch up and work on your growth mindset before you start with the GMAT.
I don’t think data insights requires any other particular skills or abilities than reading comprehension for example. In reading comprehension you analyze text and you answer questions and in data insights, UNI chart and text and graphs and you also answer questions. Both of these question types are about strategy, about how you read and analyze the text and they’re both time-consuming.
However, now that you do not have to study grammar and worry about things such as idioms and parallelism, you should have plenty of time to invest into data insights, which is not really new but is more important now.
Posted from my mobile device