LET for non-educ grad

hiii, educ peeps! non-educ graduating student here. i would like to ask lang for the process or requirements needed to qualify for LET even though i’ll soon acquire a diploma not related to educ?

i suddenly realized that i still want to pursue teaching in the future so i’m planning to take supplementary units after grad (while juggling work). i heard from friends that the minimum requirement is to take up 18 units under the educ curriculum?

do you have additional ideas or insights regarding this? it would truly be a great help. tysm in advance!