Dominant 7th`s (Appeggio Form)

Hey Im doing my Grade 5 Exam and im having trouble with the Dominant 7th of C G F D Bb A Eb E Ab B Db F# Major I know the Dominant of a Scale is the Fifth.. For now ill use Dominant 7th of C for example.. which the fifth is that is a G.. and yes it starts on G.. I just need someone to explain it to me... or give me some tips on how to remember them!! or to make them easier to learn!! Also if u know anything about Diminished 7th`s that would be greatly appreciated!! Thanks all

Cheers Musio4fun

P.S. You can email me if you would like.. i would love to here from all u talented musicians!!

It might help you to think Major or minor interval. Here is what I would do.
If you have learned the Major 7 arpeggio which is M-m-M, that is for example, C E G B G E C, or the C to E interval is a Major interval, and the interval from E to G is a minor interval, the one G to B is a Major interval. Then practice the Dom 7 arpeggio right after it.
The Dom 7 arpeggio is M-m-m, or, C E G Bb G E C . Once you have learned these beside of each Major one, then add the Minor 7th one.
Minor 7 is m-M-m or C Eb G Bb G Eb C
Fully diminished 7 is m-m-m or B# D# F# A F# D# B#
I hope this helps.