getting a 19 is more than possible with about 2 SOLID months of study. I started studying for DAT June 10th. I started out not knowing anything about gen chem - been 2 years and had B and C in gen chem 1 and 2. And I hadn't touched algebra since freshman year of high school and I was a slacker then too. Only perk was I had taken orgo within last year and it was mid-fall that I turned things around.
So, to answer your question, yes. Totally, nothing holding you back from that 19, or even 29. 🙂