From what I've experienced, the only schools that were harder to get into were those integrated ones with some airline's name behind them because of the higher numbers of applicants. Most modular schools I've visited were using a simple math/physics/English test as the entry test, which is the bare minimum they are required to do.
Even if you do get a bad score, they will try to find any solution to improve the weak parts and get you to join. I don't see much of a problem in this because with modular, if you think that training is too hard, you at least haven't paid a huge amount of money upfront and can even try to at least get the PPL.
There are some modular schools that do those airline type assessments (iq tests, sim, interviews) which can make them seem highly reputable and serious, but people shouldn't be fooled. This only gets you heavily invested in their process, which is a well known marketing method.