UPSC

Hi Amit,
The Drugs Inspector post is under Department of Health and Family Welfare, Ministry of Health & Family Welfare. The organisation it is attached to is Central Drugs Standard Control Organization CDSCO with the pat ban dof PB-2 Rs.9300-34800 plus Rs. 4800/- Grade Pay (Total emoluments Rs. 37,571/-
Age criteria:
Not exceeding 30 years as on normal closing date for General Candidates. Relaxable for regularly appointed Central/UT Govt. servants upto five years in accordance with the instructions or orders issued by the Govt. of India from time to time. For age concession applicable to some other categories of applicants, please see relevant paras of the Instructions and Additional information to candidates for Recruitment by Selection.
Essential qualification:
(A) EDUCATIONAL
Degree in Pharmacy or Pharmaceutical Sciences or Medicine with specialization in Clinical Pharmacology or Microbiology from a recognized University or equivalent.
(B) EXPERIENCE
(I) Eighteen months experience in the manufacture of at least one of the substances specified in Schedule C to the Drugs and Cosmetics Rules, 1945 or
(ii) Eighteen months experience in testing of at least one of the substances specified in Schedule C to the Drugs and Cosmetics Rules, 1945 in a laboratory approved for this purpose by the licensing authority or
(iii) Three years experience in the inspection of firms manufacturing any of the substances specified in Schedule C to the Drugs and Cosmetics Rules, 1945 during the tenure of their service as Drugs Inspector.
NOTEI The qualifications are relaxable at Commissions discretion in case of candidates otherwise well qualified.
NOTEII The qualification(s) regarding experience is relaxable at the discretion of the Commission in case of candidates belonging to Scheduled Castes/Schedule Tribes in respect of posts reserved for them.
For more details, refer the document:
https://upsconline.nic.in/ora/Detail.php?post=967&case=799&id=1

Hi Shivani,
Though there are various books for UPSC GS preparation. But first, your focus should be on completing the basic NCERTs. Once you are done with that, focus on the mentioned books:
History of Modern India Bipan Chandra (History)
Indias Struggle For Independence Bipan Chandra (History)
History Of Medieval India Satish Chandra (History)
Indian Art and Culture Nitin Singhania (Culture)
Geography of India Majid Husain (Geography)
Oxford School Atlas Oxford (Geography)
Indian Polity for Civil Services Examinations M. Laxmikanth (Polity)
Indian Economy Ramesh Singh. (Economy) or Mrunal Video Lectures
Economic Survey (Economy)
Science and Technology: Follow current affairs
Environmental: Shankar IAS Environment Book
India Year Book (Current Affairs)
Manorama Yearbook (Current Affairs)
These will be the best books for prelims stage, for mains a totally different approach would be needed.