Anyone familiar with AED scheme?

I entered with a masters and a FCH degree as an AED13

2016 aed13 C 4.1k
2017 aed12 C+ 4.4k
2018 aed12 C 4.6k
2019 aed12 grade not know yet but maybe C or C+ 4.9k

Can anyone advise on the trajectory? How long will i stay as aed12? I think i am working pretty hard already, what can i do to move myself faster along the ladder?