B.A

Hello Somi,
The following are the top colleges for B.A in economics:
1) Lady Shri Ram College for Women, Delhi
2) Loyola College, Chennai
3) Madras Christian College, Chennai
4) Fergusson College, Pune
5) Presidency College, Chennai
6) Hans Raj College, Delhi
7) Hindu College
8) Ramjas College
9) Christ University, Bangalore
10) KJ Somaiya College Of Arts and Commerce, Mumbai.

No, it totally depends on your interest as there are many career opportunities depending on your knowledge in every course. And doing BA after your diploma is good . You have many opportunities after doing BA so there is lot of things to do in your field do you can go for this.
Good luck.

Hello Asif,
In open universities there is no restriction on admitting students for any course. Since there is no class room, there is no limit on number of students those can be accommodated in the class. So do not worry, if you fill up form, pay requisite fees and submit form to university, your admission is assured provided of course you fulfil other criterias of eligibility.

Hello Gopikrishna, Normally admissions begin and remain open for some time after declaration of result of 12th. As these results are not yet declared, just do not worry. You can indeed apply in due course of time.

Hello Tirakshi,
This college for women under DU has good and all required information on its website. I am attaching the link for your information. One needs to physically submit application form. Also being a woman's college it does not allow anyone else to accompany student! http://ipcollege.ac.in/Viewtopics.aspx?Menuid=Admission_Procedure_484

I definitely suggest you to go with B.Sc. And in the mean while you Can focus on the history part which you have studied in the high school level. Read NCERT text from 8 to 10th regularly in case of history and geography.