Hi dancer. I took a SNS from topscore five days before my actual DAT (midjune). After I did the first test, I did not like the CR or QR sections so I stopped taking those. Ultimately, I felt neither was representative of the real DAT.
On my last topscore test, I got 19/20/18 for bio/Chem/ochem. On the real DAT five days later, I got 28/30/22. Some questions are great practice, but overall too difficult. I personally liked Kaplan full lengths the best and the 2009 ada test for full lengths were also great. Were I to do it over again, I don't think I would have purchase topscore. Focus on destroyer, bootcamp, qvault, and chads. I personally think these have greater return.