Need some advice for advertisement for a book

I wrote a book for aspirates who seeks govt jobs in India. there are many subjects in syllabus and my book only focus on "General knowledge". Book is almost complete but I dont know how to advertise and what to include in advertisement. please help me . there are some information that will help in better advice
1.competative advantage - My book is very concise thare is not any popular book that concise as this book,but despite being concise the book covers maximum important topics.
2...

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