Verb conjugation of "aprire" in Italian

We called it the 'Progress Tool' but full course or complete online lessons may have been better terms to describe what we have intended. The website uses special technology and crowd sourcing to enhance the knowledge of each user.
It certainly is one of the reasons that a student from abroad is not as good in English as people who were born in America. This is an obstacle for all students and a challenge for the educational system.
The first 2 are available for 400 euros. The 2 additional tickets I am offering for 600 euros each. That is: For 2 tickets, it would be 800. For 4 tickets it would be 2000 Euro in total.