The Resultant Greek Testament. The text was produced by Richard Francis Weymouth.
It was what resulted from his compilation of readings from Stephens (1550), Lachmann, Tregelles, Tischendorf, Lightfoot, Ellicott, Alford, Weiss, the Bāle edition (1880), Westcott and Hort, and the Revision Committee of London.
Mounce is quite good. I strongly recommend learning in community. Also little bits everyday, do some vocab (Anki/memrise/physical flash cards), read some text aloud, revision. And aim to do two lessons per week.