QUOTE(Juan Carlos @ Jun 20 2011, 11:48 AM)

-Paul Harris "Improve your Sight Reading" (various levels). An excellent series, very well-graded as far as I can judge.
- ABRSM sample tests. The pieces are exactly like the ones you get in the exam, that's their great advantage and they're musical.
These are the only 2 books I've encountered so far...
The Paul Harris series is pretty good for learning different rhythmic patterns in set keys. Quite a steady buildup, I must say, ... although I struggled with the grade 4-5 book ... right up to my grade 4 exam... Perhaps it was because I have difficulty "sounding out" or finding "musicial sense" in a piece if it doesn't seem to "make sense" right off

... which I found was the case with many of the exercises
Fortunately, the sightreading piece the kind examiner gave me was short, nice, and made perfect sense (musically! It had a proper tune!) so I came out with 17/18 for the sightreading section
The best way to start off, before plunging in, is to look at the key signature, time signature, and check for tricky spots (hard shifts, unusual rests/tied notes, etc.)
If you have time, try it out at least once... or just try the difficult bars.
Just at the end, take a quick peak at the dynamics and articulations.
I think using the prescribed fingering/bowing is not required? If that is so, it leaves you with fewer things to think about!

All the best for that grade 6 exam!!!