Is the Scratch Paper Good enough

Buy a non-permanent ink pen from Stadler and few pieces of transparencies. These give you the same effect. Better to simulate test environment when doing revision. Oh ya, use a stopwatch too.

I think it depends. Mine made my GMAT experience absolutely horrible.
When I first sat down the pen didn't work at all. I was having to write 12-14 lines to get an 'X.'
I dealt with that as best I could for the 1st couple problems (although not with much luck) and eventually raised my hand, waited 3-4 minutes, and requested a new pen.
I am afraid the new pen was more of the same, and it too didn't want to write.

I contemplated requesting a third, at a cost of 4 minutes, but just gave up. I assumed that if 2 pens could be bad, so could 3, and maybe it was the pad, not the pen.

Overall it was miserable and completely effected my concentration and scoring.
The testing center was in Arizona, and was indifferent to the situation. Not even so much as a 'sorry.'
I had assumed everyone dealt with such a terrible pen but I guess it was just me and the poor other soles that take their GMAT in AZ...

I felt the test centers must give each candidate a new pen and few scratch papers. After all, we pay US$250 and what is a $2 pen to them. In my case, the test center coordinator was doing other things and not observing me despite having a CCTV in the test room. I raised my hands and no one appeared.

GMAC should investigate this and look into a better process

I'm almost certain those proctors get paid something like $10/hr, so why would they care? GMAC just doesn't care about the quality of the test's administration. And why should they? bottom line bottom line.

My advice is always to take control of the test. Expect the worst, learn to write with a ridiculous marker and write smaller. That way, you won't need no stinkin' proctor.

If we need to apprise GMAC of this, how do we do that? But, I am sure those folks would be knowing this and hopefull they make the change.

It is really bad that you should be worrying about the quality of pen/paper rather than the questions on your screen.

They do give new pens, at least everyone in my room got a new pen. You need to test it before it starts, uncap it and look at it, does it look used? make an X on the front, it doesnt matter. Everything is videotaped, they aren't going to cancel your score because you put an X on your pad to test your pen.