I found using the negation test is very useful for Strengthen/Weaken questions. For example, for harder strengthen questions, it is not easy to tell if one answer choice strengthens the argument, but after negating the answer choice, it is much easier to tell if the negated choice weakens the argument than telling the answer choice strengthens the argument.
I believe it is because sometimes it is easier to look it from the opposite perspective.
I want to ask if there is any caveat with this test.
Thanks!