Okay , but how was this score calculated, I never submitted prediction for hold-out portion of the test data ?? Am I missing something here ??

And public score also changed , why is that ??

> "I never submitted prediction for hold-out portion of the test data ??"

A random selection of 70% of the test data was held-out for use on the Private Leaderboard.

> "public score also changed"

Your displayed public score corresponds to the public score of your best performing private score out of your two selected submissions.

Its not using my best public score, and I can't select the best score either, is the platform bugged or something???

bro😂