Dear Friend
Thank you very much for approaching CareerGuide.com Your background with biology major along with math as optional seems to be good. As you have asked about short term training course for two to three months without showing your specific interest in any subject. Even you have not shown the specific career goal which must be defined at threshold level, try to make these things very clear otherwise how you give a shape of your preparation. I can recommend you certain short term training course which is known as vocational course but it will not give you any sustainable option for further growth in career.
I will suggest you certain things which could be achievable as you can explore the way of learning:
1. First you try to screen the field of interest whether you want to prepare for medical entrance test or biotechnology or pharmacy or forensic science or medical laboratory technology or herbal science or some other relevant field in biological sciences.
2. If you get it done then things become easy to percolate down at preparation level. It is hundred percent true that content of your preparation will be different which depends on the subject combination and its pre-requisites. So decide first what you want to opt accordingly you have to procure the content material for your self study. Since you are looking for short term coaching which is also good like Vidya Mandir, Aakash etc offer the different module based training course for such purposes. Even Brilliant Tutorial provides the material for your self study purposes you ca purchase it through online mode. But these are all provide you the complementary tools for your basic as well as advance study. If your basic as well as applied contents those come through the self motivation, analytical mind and matured intellect are not at par then these all complementary support will be meaningless so focus on your basic instinct before joining such training course.