You can find good articles on net or on quora that can help you study well and clear certain concepts.

For getting the book kindly check on to 

https://www.amazon.in/s?k=du+llb+entrance+books&adgrpid=55768477341&gclid=CjwKCAjw9dboBRBUEiwA7VrrzXP0wMYsHEegQg__JBjjeyYjpGGHyFwoel4ZcwUMabABq4YbMoeBNxoCASsQAvD_BwE&hvadid=294149683823&hvdev=m&hvlocphy=9061722&hvnetw=g&hvpos=1t1&hvqmt=b&hvrand=11071721773115994461&hvtargid=aud-749292937830%3Akwd-300762788585&hydadcr=7461_1769308&tag=googinhydrmob-21&ref=pd_sl_8xszxzz9ca_b