Science

Hi
M.S in Pharmacy can be pursued from University of Waterloo, Dalhousie University, University of Alberta, Memorial University of Newfoundland and University of Toronto.General admission requirements include exceptional TOEFL or IELTS scores, strong academics with a minimum average of B+ in the undergraduate courses, resume, statement of purpose, letters of recommendation, GRE (as per the University requirements), and financial documents supporting the entire cost of the student's education and accommodation in Canada during his study period.The degree includes a thesis-based or research-intensive coursework program coupled with an internship period followed by an examination meted out by Pharmacy Examining Board of Canada (PEBC).Funding is generally available in the form of scholarships, assistantships and awards. The tuition fee for it is between 15k to 30 k dollars depending on the university you choose.

This is the All India Entrance Examination which is conducted by the UPSC (Union Public Service Commission) every year in the months of April and August as NDA1 and NDA2.
The basic eligibility criteria which needs to be met by the applicants in order to apply for the NDA are :-
1. You should be an Unmarried Male Indian.
2. Your age should be well within 16.5 to 19 years.
3. You should be a minimum 12th pass from any recognized state board or school. No minimum percentage is required.
4. You must have studied Physics and Mathematics if you want to apply for the Air Force and Naval wings.
5. Also physical and mental fitness is a must for this.
Thus, in reply to your query, I would say that there is no such thing as times that you can appear in the NDA exam.

In terms of salary just after BSc , they are almost equivalent.
But in my opinion CS definitely has the edge because of wider range of opportunities and job available . With CS you can also enter into the highly lucrative area of Data Mining (salaries in crores if you go abroad). you can go for higher education MSc PhD.
IT graduates also earn a lot(similar to CS)but the problem is many Indian universities don't take IT degree for higher education. Research fields are limited (they are wide of course but I am talking wrt CS). Also thanks to the stigma attached to technical degrees IT Btech are more preferred vis a vis IT BSc(same is the case with CS but atleast you can go for mtech and make up for that if that causes problem)
As for course work IT is easier. For most part IT and CS courses are similar but CS involves more Maths as compared to IT. So if you are a bit uncomfortable with Maths , take IT.
In the end its your choice. Hardwork and determination can take you to the moon even if you come with an obscure degree like btech in food storage.
What i said above was keeping in mind the general trend (the averages). But exceptions are always there.