You are never going to make the 8 with a negative for/against so the Tigers simply have to start winning.
They are equal on 16 points with the Sharks but having a -48 differential compared to the Sharks + 16 is simply not going to get them far at all.
That said, currently all teams have played the same and have the points allocated for the bye, you can't look backwards but I will, the blow-out V Parra 1st time round has not helped their +/-. Revenge, is what is needed.
Again, can't look back but 2 games where they could have/should have/may have - v Penrith & v Storm would see the team sitting on 20 points but with a differential of perhaps -40. It doesn't work that way, does it?