Hi,
See it totally depends upon your decision what should you opt for we can only help you,  if you want to go for upsc then you should start preparing by today itself as it take a good strategy and a lot of practice to crack the exam. Also you can do on thing if you don't clear upsc after your graduation then take admission in embryology and then side by side prepare for the upsc exam because this is the most difficult exam and if you clear it your life totally changes so go for it and work hard.
Hope it helps..