TBH I don’t really understand what you are saying.
You must complete an approved course of training with an EASA ATO in order to sit the EASA exams. (Unless you can self certify as an experienced non EASA multi pilot aircraft pilot; you can search for those requirements on these forums).
What else you may have done Ground school wise is irrelevant.
Have you ever studies at an EASA ATO? If so, talk to them about this.
If not you are effectively starting from scratch unfortunately.