Available drivers are broken into two groups - A and B - based on their past performance. These groupings will not change during the season. All constructors are in one group.
For each race you must choose a three-driver team, which includes one member from the A List and two from the B List. You must also choose one constructor.
The deadline to make team changes for the next race is 00:00 UK time on the day of qualifying (i.e., before Saturday qualifying starts). If you don't make any changes by this deadline, your team will remain the same for the next race.