Science

B.Sc. Computer Science eligibility: Candidates can apply after having cleared 12th qualifying examination with Mathematics, one language and two other elective subjects as listed academic subject obtaining 55% marks or securing at least 60% marks in Mathematics. Candidates who have studies Physics, Chemistry/ Computer Science and Mathematics will be given a 5% of advantage in the Best of Four calculation. If you satisfy the criteria mentioned above, you can apply directly to DU. The application form of DU admissions 2018 is expected to be released in May (tentatively). Regards.

Hi Aniket,
No, I am very sorry to say but you cannot. There are certain standards and rules which you must follow when you are applying to a university or college, you cannot jump from one course to another without a process. If you were interested in astronomy you should have thought about this earlier. The only option for you is to start your Bachelor's degree again but only if you had science in class 12th. If you do not have the slightest of the education background required you have no chance but to see open learning online programs like EdX, CourseEra, etc.

In order to perform well in CLAT 2017, Shiksha has compiled a set of tips and tricks from previous years CLAT exam topper. Aspirants can follow the success mantras of CLAT toppers and score/rank higher in the law entrance exam this year. Please refer to the link provided below for preparation tips as suggested by toppers of the CLAT exam.
Link:
https://www.shiksha.com/law/articles/crack-clat-2016-with-exam-prep-tips-from-toppers-blogId-12514

Please refer to the link below for detailed information:
https://ask.shiksha.com/among-bsc-agriculture-or-b-pharma-which-is-better-option-qna-3040234

No, it does not offer Ph.D in agriculture science via distance.
Please refer to the link for details of the programme:
https://www.shiksha.com/science/course/ph-d-in-agriculture-science-maharishi-arvind-university-jaipur-282321

Refer to this link for details: http://hsee.iitm.ac.in/elig_crit.php
You can refer to books like English and Comprehension Skill by RS Aggarwal, Analytical and Quantitative Ability by RS Agarwal Quantitative Aptitude.