Information Technology

Hi Bishal,
Information Technology (IT) is the application of computers to store, study, retrieve, transmit, and manipulate data or information, often in the context of a business or other enterprise. IT is considered a subset of Information and Communications Technology (ICT).
While Information science is an interdisciplinary field primarily concerned with the analysis, collection, classification, manipulation, storage, retrieval, movement and protection of information. Practitioners within and outside of the field study application and usage of knowledge in organizations along with the interaction between people, organizations, and any existing information systems with the aim of creating, replacing, improving, or understanding information systems. Information science is often (mistakenly) considered a branch of computer science however, it predates computer science and is a broad.

Hi Himanshu,
You can give an additional exam for maths, before heading on for your graduation (but for that, you may have to drop for 6 months or even a year, as you didn't had maths previously), so that it can be added up to your grade card and could open up the fields asking for maths.
After that, you can proceed for BCA, and then MCA.
If you had a commerce background, then you can pursue for B.Com. IT, but you will have to do additional courses like Programming languages(C, C+), DS, Networking, etc. which are among major subjects of BCA, and becomes a base for doing MCA.
But you know yourself better. So if you think that you are capable enough to cover up that basic knowledge with double hard work in MCA, you may proceed with your own plan.
Because, even B.Com. IT provides you with subjects of computers like C programming language, DS, CAD, DBMS, Basics of Computer Applications, etc., which are a part of BCA (but will only cover a basic knowledge about the subjects and not deep study as the BCA offers).