The online resources are designed and compiled by less experienced and less Qualified people. The real test (GRE conducted by ETS) is very much researched and throughly reviewed sort of thing.so, you must consult very closely designed material for cracking GRE. Here is my experience and research of GRE test and about material.
If some one need practice material that is very close in content and difficulty level , he must go through ETS official guide and GRE big book.
ETS guide 2nd addition is more than enough for a 320/340 score.A meticulous and careful use of this only one book accompanied with Power prep software (Free available) and GRE Quantam (website) video explanation is more than enough. . secondly, GRE big book is also an official book but it is for old GRE. Although it is outdated yet it contain 5000 question made by official examiners,i mean not bad.
1- GRE official guide (600 pages)can be downloaded here free
https://skydrive.live.com/view.aspx?...JDAQ4_iMxw4UaE
But i recommend don't use it on ur gadgets (ebook reader,laptop or smart phone etc). This Book is available at Urdu Bazar Karachi or Lahore just PKR 500 RS (Pirated) original will cost 3700/ PKr
2-Power prep soft ware contain 2 full length time tests.This can be downloaded here
http://www.ets.org/gre/2010/14539.html
Use one Test before preparation and save the other and use it after a full preparation.This will tell your prospect score exactly.
3-GRE Quantum must be used with the above mentioned 2 resources. once you become familiar, you can have better idea how help full and complementary this 3rd resource is.you can explore it here for free.
http://www.grequantum.com/greogandpowerprep/
Bur don't forget to open it after going through this 1st and 2nd link
4- GRE Big Book (1100 pages and 27 full length tests)can be downloaded free
https://skydrive.live.com/view.aspx?...Kvn06e4zmrdYBw
My advice is that you must use the hard copy of this book.As it can be bought just in 200 pkr (pirated) readily available in Urdu Bazar Lahore.
Although it contain some irrelevant (old Gre) question (40%) , yet it contains far better questions than that in Kaplan, Manhattan , Nova ,Barrons and all other unofficial guides.
In short ,searching and using online test material will cost a good chunk of time and in the end you will be frustrated. Barron,Nova, Kaplan, Princeton and Manhattan all are compiled just for making money and using these books can be real time waste. however, Manhattan Book 7 and 8 can be used if someone have difficulty in verbal, vocabulary and analytical writing.
manhattan Book 7 and 8 can be downloaded here.These books are not available easily.original books are expensive and pirated set is not available here in Pakistan(as per my knowledge).
https://skydrive.live.com/view.aspx?...JxafpbB4Bx40b8
https://skydrive.live.com/view.aspx?...JxafpbB4Bx40b8
if the link doesn't work as it sometime do you can request by email
one more thing never ever join any academy for GRE preparation as it is harmful for your reasoning abilities.The techniques communicated at Acdemies are antithesis to your verbal and quantitative abilities which are in fact going to be checked in REAL GRE.
Feel free to make Queries written clearly and concisely.my email is in my profile.