The way of study is that You must have one book on which you have a Perfect grip but this book will only work as a key or fundamental notes...
Consult other books too and keep on adding newer things to your fundamental book i.e Harley is yours...
Consult as much as you can according to topics until the exam come....
Be Steady,Uniform and Perfect...

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If I am what I have and if I lose what I have, who then am I?