Accuracy During Attempt vs. Analysis

Hello, so there's this idk problem i have been facing recently where during the actual VARC sectional or mock attempt i don't seem to understand the passage very well and even the options seem alien at times, but when analyzing the same attempt without even re-reading the passage attempting the ones i did not attempt or the ones i got wrong I'm able to get it right most of the times. I don't exactly understand what might be causing this. May i please know what I might be doing wrong and/or how can I fix this?
Thank you. Regards