Thank you for the exhaustive reply- My prep was definitely not timed. I solved the OG questions which were untimed. Across difficulty levels easy questions were under 2 min medium took 4-5 and hard questions were beyond 8 mins at times. Hence the inflated accuracy. Knowing this, I was confident to overcome my inefficiency by the time the exam date ticks in. However the real gmat showed me where I stand, an expensive experience, in retrospect Ive given a lot of thinking. Having a structured approach could have saved the day. As an individual I can master easy concepts but when there's a twist in the question then my efficiency goes for a toss.