Hi,I would like to know where can i take o-levels exam in malaysia?

I wanted to do foundation in science leading to medicine right after i receive my spm result.But unfortunately,I got a C+ for my chemistry,and when i ask the medic colleges,they said i'm not eligible for doing medicine bcoz i got a c+ in my chem,and the entry requirement for doing medicine is to get at least Bs in all the science subjects.I was blank.SO,i decided to resit for spm for chem,but i heard the registeration was last month.I didn't know that, bcoz i was too busy in my work..I know it''s so stupid.And then finally my friend ask me to take o-levels exam only for chemistry..BUT I HAVE NO IDEA WHERE TO TAKE THE EXAM/??     

If i get to do the o-levels exam in chem and get a B at least,hopefully the colleges will accept me and let me to do medicine..Please i need ur help..I know its my fault to not to study hard for my chem..BUT NOW i realised my mistake...and i really want to study for medicine since i  got gud results for my other subject except chemistry..PLEASE SOMEONE HELP ME...WHERE CAN I TAKE THE O-LEVELS EXAM FOR CHEMISTRY..and if can i need a bit of info about taking o-levels exam..Please...  and THANK YOU...