Organic Reaction mechanism is needed for JEE Mains + Advanced as well?

As JEE mains 1 is approaching real soon!! I have nearly no much time left and doing syllabus completion as fast as possible, Do I need to study learn Organic reaction mechanisms for JEE mains?? Or it can be skipped is it fine ? I study that later and grind on pyqs for Oc cuz I have done direct reactions from Ncert itself till now pls reply..