In stead of only reading the questions in forums, you may try to participate actively by answering the questions posted in GMAT Club and Manhattan GMAT
. You can take the free CATs at Manhattan GMAT
for practice. Also you can join Grockit where you can practice many questions as well as CATs.
It is not worth to practice questions from unrecognized sources (such as 1000 series or brutal sc) as those contain many nonstandard questions.
Note: This is not a GMAT verbal question and so moved the topic to General GMAT Questions and Strategies forum.