hi,
the general eligibility criteria for food inspector position is candidates need to pass graduation degree in food technology/food science/public health/ dairy technology or any other related discipline, however syllabus may differ and depends on the recruiting body, for government exams like upsc questions generally comes from aptitude, gk, basic science, verbal and logical reasoning, english.
for gk course you may folow luncent gks or arihant books.
rs agarwal is best for numerical aptitude, reasoning portions.
follow any good grammer books for english questions and daily read newspaper for current affairs.
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