@mdrainwater
Hello Michael, congratulations on your grade 1 progress and welcome to the community.
Given your issues I would say to spend a little more time consolidating Grade 1 before you move on, especially learn and play songs that contain C major and work on that chord formation and progressions changing to and from it.
To improve the C chord formation, try this:
- Hold your fingers near to but not touching the strings.
- Touch the fingers where the chord is but do not press.
- Once you have all three touching at the correct place then press them down.
- Do not strum - this is a fretting hand exercise only.
- Release the pressure after a few seconds but keep touching the strings.
- Then move your hand away from the strings by a small amount. All fingers away.
- Repeat the process.
Then, to improve changes to and from the C major chord and other commonly grouped chords, repeat the above process with one alteration. After the final step of lifting all fingers away, the next cycle would be over the chord that you are changing to. Once that chord has been done and fingers are lifted away, go back to the first chord of the pair.
Wash, rinse, repeat.
Make this exercise last about five minutes.
1 minute - C alone
1 minute - C & Am
1 minute - C and G
1 minute - C and D
1 minute - C alone
Practice daily and within a week you will be smashing it! 
Cheers
Richard