Hello Afreen,
The GRE/GMAT way requires you to have a 10+2+4 education which means that you are one year short. There are three options available for you to go abroad and the routes are through study and job channels.
1) Complete your Masters and then try to go for studies after cracking GMAT for Business Studies. This is specific to the US. There are options in Canada for Science programs but I am not aware of an upgrade path to the Commerce program for going abroad with a undergraduate degree. I know a lot of people who have gone after completing their post graduation.
2) Work for about five years then apply for a PR in countries like Australia and Canada.
3) If you get into a job and your company has divisions abroad, you can opt for an internal transfer to the country of your choice.
Feel free to ask any querry