Commerce

Yes, you can get admission into this college easily if you score atleast 45% in your 12th. BCA will be much more easy for you, if you have studied computer science and maths in your 12th and even if you haven't studied these subjects in your school still you'll be able to get admission into BCA. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming

You need not to learn basics of commerce for MBA entrance.
Almost every MBA entrance exam's syllabus is as follows:-
Verbal ability and reading comprehension: This section of the exam paper determines the grasp a candidate has on English language. The question paper will comprise of passage, and questions based on the passage. Through this section, a candidates vocabulary, grammar, synonyms, antonyms, sentence completion, comprehension is tested. To answer the questions, the candidate must first understand the contents of the passage, and secondly, use correct phrases, words and expressions. Quantitative aptitude: This section of the paper assesses a candidate's ability to solve numerical calculations with speed and accuracy. To excel in this section, the candidate must have a good understanding of ratio and proportion, percentage, interpretation of tables, charts and graphs.
Logical / abstract reasoning: This section determines a candidate's ability to think quickly and accurately. Candidates can expect questions on verbal reasoning or on diagrams and figures in this section.

The NISM certification is very valuable as a core qualification for students and professionals looking for a career in the financial markets. It is open for people from any educational background, not only to those from commerce, management or economics. Freshers with just a graduation degree and a NISM certification can make decent careers in the financial services industry. Passing the various certifications of NISM is the prerequisite for activating and operating the securities trading terminals in India. So, if you want to build a career as a stockbroker, or as the employee of a stockbroking firm, you need to get certified by NISM compulsorily.
NISM publishes various books and articles for the market participants to enhance their skills and knowledge. Most of the examinations have a validity period of 3 years after which the candidate has to reappear in the examination. This is mandated because the world of financial markets is an ever-changing and dynamic field and the candidates have to keep updating themselves so that they are in tandem with the developments in the financial markets. If you are interested in appearing for the NISM certification you can join an easy online based NISM preparatory module in NISM Preparatory courses. If you are interested in stock market then NISM certification is worth doing.

Yes, students from every stream can pursue BCA. Just make sure that you clear your 12th with atleast 45%, so you can get admission into colleges easily without paying any donation. Also, start learning C programming language as it'll be beneficial for you if you know this language before taking admission into BCA. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming