Amar_Sur,
The best resources for study are listed in my links above.
You should also be aware the "dumps" is an english keyword that is used for cheating on exams and not legitimate exam study preparation. The "dumps" and dump sites are taking short cuts by making illegitimate copies of test questions to cheat on the exam.
You should avoid anything that is "dump" related and stick to official material or that produced by legitiamate Juniper education partners like iNetZero or Proteus.