Colleges in Ranchi

You can get it online on Websites such as Amazon, etc. Or, you can visit Shamshad market in Aligarh (In case you are in Aligarh) or you can get it couriered to your location from the nearest market.

In-order to get admission in Ranchi University for Post Graduate course in Botany, you have to clear the entrance exam organized by the university.
Admission Eligibility: B.Sc/ B.Sc (Hons.) with 55% aggregate marks.
For More Info please visit: http://www.ranchiuniversity.ac.in/2014-03-31-05-27-00/2014-04-02-06-49-40/botany.html

No, as you said that you are already pursuing, you don't need to give any entrance exam.

Teaching and facility wise, XISS, Ranchi is a better option for HRM. But, XIME-Bangalore has better exposure because of the location of the college and plenty of opportunities.

No, there is no course for B.Sc. Agriculture in Central University of Jharkhand. Please refer to the link provided below for a complete list of courses offered by this institute. https://www.shiksha.com/university/central-university-of-jharkhand-ranchi-32716.

Hi,
Yes, Jharkhand Rai University offers B.Sc Agriculture.
Eligibility: 10+2 in Science from any recognized board
Duration: 4 years
No. of Seats: 120
Fees Structure:
Admission Fees- Rs. 10,000
* Rs. 40,000/Semester(For Students From Jharkhand)
* Rs. 45,000/Semester(For Students From Other States)
For more information please visit the link:
http://www.jru.edu.in/programs/faculty-of-science-engineering/b-sc-agriculture/
Hope this helps.
Thank you.

Not recommended. It's good for HR and RM.

Yes, except for arts subjects like English, Hindi, Maths is compulsory. Yes, for admission in B.Com or BBA or any Science stream. However, in mass communication and B.M.M, you don't need maths.

The basic eligibility criterion for pursuing B.A. (Hons.) (Economics) degree is qualifying 10+2 or equivalent examination in any stream from a recognized board of the country.
Some universities give preference to the students having economics in class 12 but Ranchi University is not one of them.

The average is 5.3 lakhs and maximum is Rs 13.5 lakhs.