Class 12-science

BCA without maths, because BCA is something which revolves around the understanding of computer structures and various algorithms and coding, therefore, maths is a compulsory subject for the same (at least for the first year). Rather, many institutes allow you for the admission if you have scored 60% or more in maths, in the 12th standard. But you can go for some other stream or field, like B.Sc. Or B.Com. Vocational/IT, if you're way too interested to have computers as your subject.

Obviously, do what you love. There are many people who complete their engineering and do what they love. Engineering is just a backup. My friend is doing preparation for IIT and dreams to become a musician.

Economics at SOAS probes the mechanism of society and explains the factors and processes that underpin production, exchange and distribution, in order to effectively inform economic policy, as well as to understand the consequences of economic and social well-being.
Students are encouraged to develop a deep understanding of particular countries and issues, based on concrete analysis of history, institutions and political economy. This reflects a shared view at SOAS that economics should be rigorous, reflective and, fundamentally, useful.

No, these marks and the specifically the rank you have can be used once in counseling of 2019 admission.

Here is the eligibility conditions for becoming Loco Pilot:-
1)Candidate must complete the minimum 10th standard
2)Candidate need to complete the ITI in any specific trade to apply for this post
3)Minimum age is 18 years. Maximum age is 30 years for general category candidates
Relaxation is there for OBC, SC, ST candidates
4)Candidates who completed the Diploma in Engineering are also eligible
Selection Process:-
1)RRB exam
2)Personal Interview.

Basic prerequisites to become a pilot are mentioned below: You must complete Class XII under the 10+2 system or its equivalent with a minimum of 50 per cent marks in maths and physics. You must be at least 16 years of age to be eligible for a Student Pilot License, 17 for a Private Pilot License, and 18 for a Commercial Pilot License. Alternatively, you could directly enroll for the Private Pilot License once you have cleared Class XII and are 17 years old. This involves taking an exam conducted by the Directorate General of Civil Aviation* consisting of theory papers on air navigation, aviation meteorology.

A Commercial Pilot License (CPL) is a qualification that allows you to act as a Pilot in Command or PIC of a single pilot aircraft or as co-pilot of a multi-pilot aircraft. The basic requirements to obtain the CPL license are published by the International Civil Aviation organisation (ICAO). However, the actual courses in flight training programs vary from country to country, based on the National Aviation Authorities (NAA). The educational qualification is 10+2 or equivalent with 55% marks in Physics and maths individually for General Category candidates and 50% marks individually in Physics and Maths for SC/ST/OBC candidates.

Hello Goutham,
You may pursue BBA as your graduation course. But remember it requires the knowledge of mathematics. At the same time, you should be interested in solving problems, queries etc. BBA is a course that develops your skill in handling and setting up a business.

You need to clear off your higher secondary first then you can think to pursue further.