"Happily keeping a 4.0 GPA, more happily done with that class" Is this sentence grammatically correct? It sounds wrong but might be right. Please help.
It's incorrect to use 'more happily with that class' instead you can use 'gladly done with the class'.
In your sentence more and that makes it wrong.
Then,for the first happily which you have used in your sentence can be replaced by 'Delightedly'.
So on the whole sentence should be framed as follows "Delightedly keeping a 4.0 GPA and gladly done with the class" Hope you find it useful!