Data Sufficiency is one of the hardest part of the
Logical Reasoning section which involve very simple calculations. Of
course, many of you may not agree with me with this point. But its fact,
because in many of the cases negligence or over thinking makes you
ending up losing marks. With little concentration and practice you can
easily score good marks in this section. After all you don't even need
to do complete calculations to get answer. Most of the times, with a
simple glance on given options you can choose the correct answer.
What is Data Sufficiency ?
Of course there is no technical definition for this, but simply you can say that "its a process of checking whether the given data is sufficient to get the answer or not".