Some Advices Regarding to Preparation for Mathematics Graduate Programs I am a rising senior at college in US actively pursuing the mathematics and microbiology majors.  I am deeply interested in the arts of topology and set theory, and their applications to the machine learning and biological data analysis.  My plan is to apply for graduate programs in mathematics, but I did not decide pure or applied as I like both aspects of the mathematics.

Started out as a microbiology major, I did not begin to pursue mathematics until the end of sophomore year.  Started from my freshman year, I have been haunted by a severe case of OCD, which seriously interfered with my study and undergraduate research, and subsequently my grades and research performance were not good (my current GPA is below 3.00....).  When I first noticed the signs of OCD, I thought I can handle it with my mental strength, and the they will go away by their own (like a cold virus), which I realized are big mistakes!!  Starting on this Summer, however, I started to receive psychological counseling and medical treatment, which have been helping me a lot.  

Although my grades are not good, I took some graduate-level courses in microbiology and advanced courses in mathematics and got A's.  On this semester, I am going to take the advanced classes in both math and microbo, including one graduate-level course in mathematics.  I also got several opportunities in the undergraduate research and mathematical reading courses with professors of my big interest.  Although OCD is still affecting me, I am in a much better position now as I started to regain a control of myself.  

My question is that if it is too late to start preparing for graduate programs in mathematics.  If preparing for mathematician is late, then I would like to search other opportunities.  Another worry is that I fear the admission committee might look down on students with mental disorders as people who have weak mentality and cannot handle their problems properly, thus are not suitable to learn mathematics.  Could you provide me some advice about preparing for graduate programs in mathematics?

I am planning to stay one more year after my senior year, or possibly two years.
Disclaimer: I'm not in the field of mathematics, but I have been in a similar position

I think it is still possible for you to switch to math. It helps to get some more research experience if your GPA is not that great. A good reference and research experience will make up for a lower GPA in a lot of programs. I had some mental health issues during undergrad, and took an RA position for a year before applying. I cited health issues as a reason for my poor grades (&lt; 3.0 GPA), and asked the professor I worked with during undergrad to mention this in his letter of recommendation. I don't think you have to explain your mental health issues in detail during the application process.