can u please suggest a good book for preparation for du ll.m. entrance. what about preparing from 10 year is that useful.

Haha.. You think you can prepare for a exam for 10 long years? You must be 12/13 years old kid then right? Chill brother, I can understand you really aim to crack the exam and thats why you asked this question but relax, things are not that difficult. Your mind must be bit immature and less knowledgeable to understand the concepts of the things that you are going to face after 8/10 years. So it's okay, the year of entrance is enough and more if you stay focused and dedicated at that point of time. So don't worry, you'll surely be able to crack the exam provided your commitment towards it's the bestesssttt.

About the books now, For Environmental law M. C. Mehta cases, the cases dealing with Public Trust doctrine, the cases of the one prohibiting passive smoking in public places, and different doctrines, the provisions, acts, cases dealing with the National Green Tribunal will suffice. And since the Constitution is the Fundamental law of the land so every one of us have much knowledge about the same either be it through political science knowledge acquired during the school or college life or garnered through observing the day to day happenings or policy decisions taken at the government level. These ones at least remind us at least once that every single thing is happening as per our constitution. Remaining ones of the Constitution most of us, may have learnt at the LL. B. itself.

And thereafter you must remember the names of last year's landmark Supreme Court's judgments.

As far as International law and jurisprudence are concerned then I must without a chunk of hesitation, say that you will have to cram it up.

Thereafter if you wish to practice upon it (the ones which you have learnt through the bare acts, books) then you can do so by taking up and solving the guide of A. K. Jain or universal which ever you like and work upon it, ponder upon it.