How likely are the chances of a LRDI section in acutal cat being like the one in LRDI Sectional IV. It was a nightmare...seriously.. unable to score a single mark!

LRDI in cat is not that hard. At least one set in the section in actual cat paper is doable. Trust me you can even end up doing 2 sets with full accuracy in the actual exam. So do not loose hope and practice a much as you can and focus on accuracy.