How to solve the SC questions that have the whole sentence underlined? There would not be a 3-2 or 2-3 splits that one can easily identify. What does these Questions generally test? Are these generally the difficult Questions on SC?

How to identify that the sentence as it is is correct? In other words, any tips and tricks to identify when the answer choice A is correct. I am suffering from the correction syndrome even though the given sentence is correct. One thing that has helped me a bit is finding an error in all of B,C,D,E

Thanks

First try to figure out core of the sentence.
Second figure out meaning of the sentence and look for modifiers, that, which, -ing error
Third POE

I agree with nag's suggestions. I just wanted to add that personally, I find long sentences that are completely underlined to be a good thing. There are many errors in them, suggesting you can identify several splits. Chances are you'll find an initial split on a grammatical concept with which you're familiar and confident. Contrast these sentences to ones in which exactly one or two words are underlined; you either know it or you don't!

Rey