What would my predicted grade for Science be likely to be?

Hello kind sir/mam I'm very curios thinking about predicted grades from ks3 to gcse. So, What would my predicted grade for Science be likely to be? With the following levels:

Start grade (End of KS2) : N/A
End of Year 7: 5b
End of Year 8: 6b
End of Year 9: 7a

...from 7a what would be my predicted grade; thanks in advanced!

THANKS!

a B/A

I got level 7a in year 8 and got predicted a B for triple science, however I get A*s, predicted grades don't mean much at GCSE level and they're usually not that accurate...