I want to became a CA but I don't know what are the preparation to be taken plz help me tell me what to do what are the exams I have to crack and what preparation to be done and l am confused between B .com and FIA

Hello,
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I will let you know about the syllabus but before that here the details you need to know about the examination.
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You will have total 3 examinations equal to 3 level's while you are going for CA examinations I.e.,

• CA foundation
• CA intermediate
• CA final

CA examination is a also known as ICAI conducted by Institute of charactered accountants of India.
Coming to graduation courses, B.com stands for bachelor of commerce and FIA stands for found in accountancy, both the courses are helpful in preparation of CA. Both the courses are based on accountancy where b.com even adds commerce subjects in it.
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Here is the link for the syllabus of CA foundation
https://finance.careers360.com/articles/ca-foundation-syllabus

here is the link for CA intermediate syllabus https://finance.careers360.com/articles/ca-intermediate-syllabus

here is the link for CA final syllabus
https://finance.careers360.com/articles/ca-final-syllabus