To be honest I'm not sure, I haven't be enable to find a breakdown of the scoring for each team.
And here's a list of tasks that were included, gleaned from the ARRSE forums, https://www.arrse.co.uk/community/threads/cgs-upgrading-challenger-and-warrior.252210/page-161
3 shoot outs, platoon size
1 hand gun firing
1 tank recovery with NBC threat
1 IED attack, tank repair and wounded soldier
1 driving only by following the orders of the commander
1 find 40 targets and report them
1 manual firing using emergency mode
There were apparently a further four tasks not listed.