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A nonzero complex numbers has infinitely many arguments. They all differ by integer multiples of 2. If you think of the argument geometrically, they are all co-terminal angles.
The principal argument is unique and is most commonly taken to be that argument in the interval (-,]. You should check with a particular author to see what interval is being taken, but (-, ] is pretty standard.
As an example, consider the number 1 + i. This number plotted in the plane would live on the line y = x at a distance (2) from the origin. So, a polar representation for this number is
1 + i = (2) e^(i/4)
Of course e^(i) is 2-periodic, so you can write
1 + i = (2) e^(i (/4 + 2k)) where k is any integer.
The argument (lower case "a") is multivalued
arg (1 + i) = /4 + 2k.
The principal argument (upper case "A") is the one number of the form /4 + 2k that satisfies - Arg(1 + i). In particular,
Arg(1 + i) = /4.

The Chartered Accountant course starts with three different consequent sections namely, Common Proficiency Test (CPT), Integrated Professional Competence Course (IPCC) and Final Course. Throughout the year registration for both of CPT exam and IPCC exams will be open so that students can enroll at any time but exams will be held at different schedules.The candidates who want to pursue CA should have minimum eligibility of 12th class.
The ICAI (Institute of Chartered Accountants of India has) framed two ways of entries to get into Chartered Accountant curriculum:
CPT entry after class 12
Direct entry after graduation
Candidates who want to stick with Chartered Accountant career should decide their mode of entry at time of Class 10 itself, because to attend the CPT exam after completing Senior Secondary Exam (Class 12), the registration must be done after successful completion of Class 10 or with having an equivalent grade from recognized board. In today scenario,it is advisable to choose CA after class 12, so that students can design their future career in advance. Critically, its necessary for the students to aware of this Eligibility criterias and Entry modes of Chartered Accountants curriculum.

Hello Kartik,
Ideally, one should start preparing for it from the third year of engineering. GATE syllabus comprises of the same syllabus as of engineering. By the commencement of the third year of engineering, you will already be familiar with a major part of the syllabus. Therefore, you can start your preparation from the third year of engineering. It is recommended to opt for a GATE coaching institute as they help to provide proper guidance. They conduct periodic tests to help you realize your strong and weak sections which will help you figure out where you need to put more focus on.
I hope this answers your question to your satisfaction. If so, kindly upvote this answer. If you have any further questions, kindly revert.