Just recently i had a discussion with a punting mate of mine,
As to how i graded races compared to what he does.

I group them into poor average and good,
Then i only bet on the good and average races.

I only bet in melbourne sydney and queensland.

I bet 7 days a week this gives me enough action.

Poor betting races.
Maidens.
Hurdles and Steeples.
2yo races
3yo races
Fillies and Mares.
cl=1
cl=2
Any Restricted races.(Age related etc)

Average betting races.
cl=3. OR (B.M.70>)
cl=4.
cl=5
MW(such as 3mw 2mwly etc)
cl=6 listed open group with,
Prizemoney less than$20k.

Good betting races.
cl=6.
Open.
Listed races.
GR=1.
GR=2
Gr=3.
Prizemoney greater than $20k.

As i use ratings as my selection method i find,
That a minimum of class 3 makes it easier to,
Find winners.

All age related races i eliminate.

This doesn't mean lower races can't be bet in,
Not at all others may find the complete opposite.

All i am saying is this is what suits my style of.
Betting others may be completely different and,
More successful in other race types.

Cheers.
Garyf.