My mate tried 2 times TFL topographic test and failed, only 10% they will pass these days, is clear that TFL wants to cap the number of PHV drivers so be very careful!!
For someone with experience will be easy probably but for a regular driver is not and some of the questions are tricky
TFL is making hard to very hard to get the PCO licence, 30k drivers will fail the English test, the numbers will drop for sure in the next 2 years