CBSE

Go for Arihant Publication book's 14 years solved question papers of IIT-JEE. It will cost you under 500:
http://www.amazon.in/Years-2002-2015-Advanced-Solved-Papers/dp/9352037251

The guidelines must have been given to you by your school already. Using a pen is never allowed, while drawing a graph, either you are in class 12th or pursuing Ph.D.

Hi Kaif,
To study MBBS or MB CHB or undergraduate medical programmes in UK, you must take the UK Clinical Aptitude Test or UKCAT. So prepare for the same. You must also take your IELTS.

Dear,
If you are having subjects like maths or economics in class 12th with your PCB subjects then you can check the eligibility in different universities for economics (Hons) programme.
Many universities offer the admission with these subjects in economics (Hons).
All the best.

CBSE is tough but it conducts the All India Entrance Exams too.

First of all, I would like to say that as you are aspiring for IAS which is a very tough competitive exam and the people getting selected are very few so go for any course in graduation which will act as a backup for your career. You can go for BBA or law or engineering. I will prefer to go for BBA because it's an easy course so you will get time to prepare for IAS exam and if you are not selected then you can pursue MBA which will give you a good career.

No, there is no special criteria for this.

Hi Roni,
CBSE has come up with a mobile application to help students locate their examination centre.
The app, named 'Exam Locator', will help students to quickly know the exam centre on the basis of their roll number.
A student can easily find the address, images and geolocation of the designated exam centre on the map and get to know how to reach there.

Hello Manish,
Syllabus of SSC is decided by the state government and hence, varies from state to state while CBSE curriculum remains the same throughout the country. Hence, it will be difficult to answer as you have not mentioned the state you are pursuing it from. On a general note, if you are pursuing it from South India, then SSC is a better choice, else opt for CBSE.
I hope this answers your question. If you have any further questions, kindly revert.