If your objective is "Buy PTE Certificate", bear in mind that only official examination results count

https://authentic-pte-certificate-onlinelzqx060.rivetgarden.com/posts/5-pte-certificate-for-visa-purposes-lessons-learned-from-the-professionals

If your goal is "Buy PTE Certificate", bear in mind that just official assessment results count. Use practice tests, improve precision and timing, and make a validated Pearson PTE result through the test.