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Well, if anyone is so keen to enter in the Ministry of External Affair. He/she could go inside through these ways.
UPSC- UPSC conducts every year an exam known as civil services based on ranks of aspirants and their willing ness various seats filled every year. If any of the aspirants is keen to hold a job or work for external affair of India he/she will opt to
IFS- IFS is an acronym of Indian foreign service. It is the ministry, which is you can say the engine of India. Its various work is depicted below
It is a branch of ministry which deals with the diplomacy of India and focuses that how the relation of India should be with other country and tries to make it firm. For ex- MODI is touring a lot of country since inception these all are planned by MEA.
It is the branch which deploys ambassadors in other country and remains in contact with the embassy. Generally more elder or experienced person hold this position.
If anything goes wrong with Indian in other country MEA is responsible to solve it with the help of embassy for ex- many of the Indians have already been rescued from the catch of ISIS in Syria, Nigeria etc. If u did not understand watch AIRLIFT movie.
These are the jobs which is considered as GROUP-A jobs in MEA. There are other jobs which are GROUP-C type job and SSC conducts it every year. Which will also lead you to MEA but lower salary any position as well.

Hello Karthikeyan,
It is good that you are aspiring for IITs. First, you need to have a good conceptual knowledge in physics, chemistry and mathematics. You need to clear all the doubts regarding the concepts. You may also give more time in chemistry as many questions will be very easy and time saving if you are clear in the concepts of chemistry.
For physics and mathematics, you need a lot of practice to improve speed and accuracy. In the state board book, the concept depth will not be in JEE level but the formulae will be really essential.
You need to have the formulae (atleast 85-90% in PCM). In your fingertips as some problems in JEE Mains will be based on the direct formulae.
You need to practice more and more as the questions demand more speed with accuracy as they have negative marks.
All the best.

Hi Amar,
My answer to the question would be a reference from Ashish Kedia's answer coz he has answered it beautifully.
If we talk of both technically:
CS takes a more balanced approach between theory and application while IT focuses more on application.
CS offers you an opportunity to learn variety of topics related to computers. IT offers you an opportunity to discovers innovative uses of those fundamental concepts.
CS generally require a decent background in math while use of math in IT is limited to data analysis / processing / statistics, etc
You may call IT as one of the sub-divisions of CS, however there are certain things that are unique to IT like integrated programming, system administrations, maintenance, etc.
While these differences exist on paper, in India the line of difference between IT and CS courses is very blurry.
Here are the similarities :
None of them involves hardwares. You may have to take one or two courses on digital systems where you will study about ICs and logic gates. Thats it. You wont learn how to repair computers in any of them.
Most of the courses offered in both the branches are related to programming. You will have to program on a daily basis in both the branches.
Now in Indian context :
IT branch was established to compensate for the increase in demand of CS. In India, demand for B.Tech in computer science has increased exponentially over the last two decades. Information Technology is relatively a new area of engineering. Most of the IT branches across India were established after 2000 to cater this demand.
Many might argue that the number of seats in CS branch should be increased rather than establishing a new branch. I agree with that argument to an extent. But I guess, cost management and operation is easier if there are two branches of 100 students each rather than 200 students in the same branch. Moreover, originally these two branches were supposed to be much more different than they currently are.
CS and IT are more common courses in Indian universities than those outside India. Both the branches are offered a lot of common electives also.
Hope it helps you.
All the best.