>Well, this is not a binary classification

You are missing that the context here is getting through an extremely selective competitive examination. Only the top 5% students by aptitude for math/science/engineering have any significant chance of getting through. The rest are just fodder for the coaching industry selling increasingly more and more extreme and ridiculous products. Soon they might start selling products for coaching the unborn baby by teaching maths to the mother too.

None of what I am saying is intended to apply to the practice of actually being a professional engineer or having a successful career.