Open Book Examinations happens where there are well-defined textbooks, not more than one or two. This system of examination is all about familiarity. That means those students who rote up the paragraphs and diagrams would now have to just remember their locations in that book.
This makes them lazy, I mean for mugging a paragraph, they would have at least read it 10 times, but now they don’t have to read it more than a couple of times. In fact, they would just scan the pages with their eyes without even reading them.
Smarter ones would simply digitalise the book, either by procuring the pdf or the ebook of that book and simply use the search option through their smartphones or computer while writing their exam.
This makes it easier for the group of friends to sit together and write their examination answers, especially if it is a 10 hour or take-away overnight exams.
I know few students from India studying in the USA, had always sent the question papers to the professors in India to solve them, and send them back, which gets submitted by the student in the next few hours.
Open book examination is like a contact diary on your smartphone. You don’t memorise the contact numbers any more, because you just need to search it in the app and you get the results.
So what happens when every examination is conducted with an open book system, you will stop saving things in your brain memory except few.
Guess what, in future, there won’t be any well-defined textbooks, because Google is going to be the biggest textbook covering everything.
Then why take admissions in the educational institutions, why not learn yourself and just pay for the examinations and certificates.