Thank you all for the answers.
Raxit85 - My plan was actually to initially filter through reviews coming up with 2-3 interesting courses and then testing with free trials.
sjuniv32 - There is a short pitch (1'30") on their website, it seems they leverage their studying paths using the "PALgorithm", AI engine that understands how you think (?) and adapts the way each problem is solved for the best fit with you. It is very promising, I just wanted to know if it's just marketing or there is something real behind. Anyway, I am going to test it today/tomorrow.
MentorTutoring - thank you, it totally makes sense to me.
EMPOWERgmatRichC - I tried a full test 2 weeks ago and scored 550 (Q38, V27) and IR:7. My preparation was 0, and I tried with time constraints... Maybe not the best choice, I didn't manage the time strategically and I had to answer randomly to the final questions. I am not scared by the quant part, I am an engineer and I am pretty comfortable with mathematics. In these two weeks, I studied using Kaplan online workshops to learn some strategies and test them on specific quizzes. Surely I have to improve the V part, especially CR.
My goal is 720 and I would like to take it at the end of August. B-schools I am more interested in are HEC and IESE. Regarding the application, I am very flexible, surely the 1st or 2nd round for Sep 2021 or Jan 2022. However, I am young, I can postpone till Sep 2022. It really depends on the score I will get and if I manage all the application processes according to my other duties.
Looking forward to becoming a GMAT assassin, then

Vittorio