Dear Student,
You can use the following books for making your word power strong:
McGraw-Hill Essential ESL Dictionary
English Vocabulary in Use Series
Oxford Picture Dictionary
504 Absolutely Essential Words
NTC Vocabulary Builders
And best books for GK are:
Lucent's General Knowledge Book 2018. ...
Manorama Yearbook 2018. ...
General Study Paper-I. ...
General Study Manual Paper-I. ...
Objective General Knowledge.
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