Here is the same. I done 75% Qbank. Now it is the second round on timed subject test. Most I got is 55% to 70%, feel very depressed. I just wonder how people can go up to 80%. I thought my second round at least increases about 10%, but actually, not much change from the first round. I have less than one month left. I don't think it will change much in three weeks time, but I will try to finish Qbank, then do some NBME.
After you take them, review all the answers, incorrect and correct. Make notes on all the things you didn't know/remember. Make those notes part of your study materials to review every day. I guarantee a big increase.