QUESTION: Fix punctuation: Schoolwork will allow teachers to assign an app and an activity within that software to see how an individual student is performing
ANS: Schoolwork will allow teachers to assign an app and an activity within that software to see how an individual student is performing.

QUESTION: Fix punctuation: What is File Extension FAN
ANS: What is File Extension FAN?

QUESTION: Fix punctuation: If your PC opens the J2T file but its the wrong application youll need to change your Windows registry file association settings In other words Windows is associating J2T file extensions with the wrong software program
ANS: If your PC opens the J2T file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating J2T file extensions with the wrong software program.

QUESTION: Fix punctuation: This studio apartment in Las Palmas de Gran Canaria offers lift and internet
ANS:
This studio apartment in Las Palmas de Gran Canaria offers lift and internet.