I was in std 12 PCB and in side Maths . I am very confused In which sector can I going .

It depends upon the stream in which you completed your Intermediate. If you are from science then you could choose a career in engineering or medical. If you are from commerce then you could for B.com similarly if you happened to be from Arts then you might like to go for B.A. However, apart from

You have both the options to opt for biology courses and math courses You can pursue btech in mech. Electrical, Telecommunications., CS, IT ,automobile etc Like wise mbbs,bams,bsc in various biology courses. So think of your interest and strength where you can perform more.