At first I was worried too...I'm in the same boat as you averaging around 18-20 on Bootcamp bio and DatqVault bio. I'm just using them as exposure to the problems I'll get on the DAT and learning from my mistakes. I will be doing them all again and reviewing all the problems I got wrong. I think exposure and practice is key, since this section is extremely random there is a lot of luck involved. With DatQvault, Bootcamp, and DAT destroyer I will have been exposed to over 1000 biology practice problems. Just study whatever you can and just go with the flow my friend. A 19 is not a bad score on practice, just use them as PRACTICE and not take them to heart. I think I saw one person on this forum who averaged 19 and got a 28 on bio on the DAT. Do whatever you can and hope for the best.