CA

Nothing is tough, CA or CMA almost same in study and it depends upon the capability of the student. Basically CMA gives more emphasis to cost and operations while CA gives equal importance to law, cost, tax, accounts, etc.
So if somebody likes more practical then go with CMA and otherwise go with CA. CMA is more practical then CA.
Foundation- CA has less syllabus with more details but in CMA have more syllabus but details are less.
Intermediate Level- CA have some tough subjects in inter level, but so as CMA consists 8 subjects with one more subject in comparison of CA have 7 subjects. CMA wide syllabus again here in comparison of CA but CA have more detailed syllabus again.
Final Level- In final level we face same number of subjects in both CA and CMA. Here we face same level of toughness in syllabus. In CMA we have choice of choosing one subject as specialization while in CA we have no such choice. So in last final level we can say CA is tough from CMA.
But in job security CA offer more job security from CMA.
And in training period CA have very tough training and whenever you complete you training after that you appearing in final level. In CA you have to complete training of three years after completing CA inter (IPCE). CMA has more flexibility.
So at last I want to say if you want to do CA or CMA then you should ready for hard work and dedicated to your course and syllabus are almost same as 80 to 90%.

Although, a some parts of the syllabus of the accounting courses is similar, the fact that the ACCA qualification offers more prospects both in India and abroad is still an advantage.
ACCA (Association of Chartered Certified Accountants), UK, is a global body of professional accountants and is recognized as the world's largest and influential accountants association expanding over 170 countries and training more than 370,000 students all over the world. Unlike CA or other accounting courses, ACCA qualification is in line with the current demands of employers all over the world.
Although ACCA is considered similar to CA qualification in India, ACCA provides additional knowledge of UK GAAP, Laws & IFRS, which directly puts you at advantage if you work for a MNC or an Indian firm that works for clients abroad. If you are doing an MBA with your ACCA, you stand a chance to attract more job opportunities to select from.
One more thing that sets ACCA qualification apart from CA is that you can acquire a degree at the same time as studying towards achieving the qualification. Obtaining this degree will surely put you in demand with employers throughout the world while increasing your career prospects.
ACCA qualification is recognized in countries like Australia, Canada, UK and many more. Their government considers this qualification as an eligible qualification for students to apply for jobs. ACCA students also get an option of studying from home online courses through accredited tuition providers.

Dear Gauri,
On clearing your class 12th, you can register for Common Proficiency Test of ICAI popularly known as CPT. However, as per the revised scheme of ICAI, CPT is now renamed as Foundation Course. It will consist of four papers-
Paper 1: Principles and Practices of Accounting (100 Marks)
Paper 2: Business Law & Business Correspondence and Reporting (100 Marks)
Section A: Business Law (60 Marks)
Section B: Business Correspondence and Reporting (40 Marks)
Paper 3*: Business Mathematics and Logical Reasoning &Statistics (100 Marks)
Part I: Business Mathematics and Logical Reasoning (60 Marks)
Part II: Statistics (40 Marks)
Paper 4*: Business Economics & Business and Commercial Knowledge (100 Marks)
Part I: Business Economics (60 Marks)
Part II: Business and Commercial Knowledge (40 Marks)
You can register in CPC until 30th June 2017 and can appear for CPT in Dec. 2017. In case you register after 30th June 2017, you have to compulsorily register in Foundation (under the Revised Scheme) and can appear for Foundation Examination in May 2018.
Out of 4 papers, 2 papers are of subjective type (Paper 1 & 2) and rest of the 2 papers are of objective type (Paper 3 & 4).
For any further details kindly visit the below-mentioned URL.
https://www.icai.org/new_post.html?post_id=291&c_id=165
Last but not the least, I would like to advise you to, right now, completely focus on your class 12th as it is your board exam. Also, if your class 12th scorecard is good, it will always keep you ahead of others.
I hope this would suffice. All the best and god bless you.