whenever i am taking past year question paper as mock i am scoring decent marks but in dashcat mocks i am scoring low. is it only with me or it's happening with all of you. i can't understand what's happening

I feel the same way. The Dashcat mocks have a higher level of difficulty than the PYQs, which, in a way, helps us improve and prepares us to handle any question on the exam day. However, for me, my self-confidence tends to suffer due to the low scores.