Scoring 79+ in each of the PTE moduels is very much possible! All you need is proper guidence. Nevertheless, we don't have any Argentinean student in our batches but we do have pupils from other cities. Aussizz excels in PTE training and thus, people from all over the state register themselves at our branch in Ahmedabad, India.
We will be happy having you here. Generally, 2 months of coaching is sufficient to get the required score you mentioned.
Do let us know further about your plan.