I am sorry that you have not received your result yet. However, the email that you received after you submitted your test should say it will be reviewed between 15 to 30 days. Since you state that it has been 20 days, you may be about to receive your results within the next few days :)
I understand this is a long wait for you, but please allow for up to 30 days after you took your test and, if you do not receive a result by then, contact firstname.lastname@example.org so someone can look into it.
Good luck & hope to see you joining the team soon!!