B.A

Dear Taposhi,
Please have a look at the Oxford website, the requirement page have it clearly mentioned , mathematics is indeed required
https://www.ox.ac.uk/admissions/undergraduate/courses-listing/economics-and-management?wssl=1
Additionally all candidates must also take the Thinking Skills Assessment (TSA) as part of their application.
Best Wishes

BA LLB is slightly better. are you looking for this year or next?

Hello Komaljeet, your academic grades will be scrutinized before your IELTS. I must also say that your IELTS grade is below par, most universities won't be accepting. There is nothing to worry though as New Zealand universities have ESL programs for students who have poor IELTS or TOEFL scores. When you apply to a program make sure you enquire about the ESL or English language foundation program. Enquire with the university directly. Another alternative is top retake the IELTS. Read this
http://www.english-schools.co.nz/
Regards

Questiona are very generic:
Logical reasoning
GK
Stream knowledge

After BA you can go for Masters in Humanities, Performing arts, Journalism, Business management and so on. According to your interest decide upon the Masters degree. Almost all the private universities offer a good no.of courses to choose from.