how many gcse's and what grades do i need to become a doctor ?

Now I am in year 12 doing my gcse's. I am doing 5 gcse's and I heard that to become a doctor I need 10 or more gcse's and some people says that if you have 5 gcse's its ok to become a doctor, I don't know what I need to believe. I am confused a lot, so please help me by giving the right information 

Thank you 

PLEASE HELP ME