Hey guys, it's my first time to post here. Hoping some of you can give some advice on my situation:
I'm an international student planning to apply to a PhD in Toxicology. My undergrad is chemistry, but I realized after college that I really want to study toxic effects of exposure to environmental pollutants.
My problem is that I've been told by several programs that I would most likely be rejected because my undergrad GPA is not high (probably around 2.5-2.7 because I screwed up my last two years in college). Also I've got 2 years of research experience in chemistry, but almost none related to toxicology.
In the last two years, I've taken some undergrad courses in biology to make up for my deficiencies in biology, and I'm currently taking some grad courses in biology. My GPA has improved, but it's still not very high. In terms of work experience, I'm a part-time lecturer in biology now, and I'm about to become a research assistant for a project that's related to toxicology.
What I want to ask is that, given my situation, do I have a realistic chance of being admitted to a PhD program in the US? Can I make up for my deficiencies with a really high GRE/GRE subject score? Do my current credentials merit a possible shot at high ranking unis, or should I stick to "reasonably good" ones instead?
I am considering some top universities, but I would be happy to get admission in a reasonably good university. I'm really desperate to switch fields now, and I would really appreciate some advice.