Hello there. Considering you are still in 9th class and don't want to be in mathematical part you still have a big decision to make. Right after your 10th you have to choose your stream in which you want to persue.

And as for being joining any company, in most the cases you need to have a degree so it might not be possible to getting directly in conpanies after 12th. 

The world is changing at a very rapid speed and day after day new things are coming in front of us and for you their are still 4 years to pass your 12th and by that time no body knows how the world will change so think for all those other possible situation that can make you head of company not only a secretary.