I’m so stressed out about this…

I’m in year 11 and I would really like to study dentistry at KCL, they heavily weight GCSEs though and they have a 40% weighting on GCSEs. I told my parents I’m predicting to get like 6 7s and they keep telling me I can’t go into dentistry especially not ones like KCL
Overall, worst case scenario 998888777776, and best case scenario 999988777776, since KCL is gcse heavy if I get 998888777776 should I resit 3 of my 7s to get 999998888776, will KCL use my resit results? And will resitting them disadvantage me?
Btw I have no reason for underperforming the first time - I just didn’t revise effectively

I’m in year 11 and I would really like to study dentistry at KCL, they heavily weight GCSEs though and they have a 40% weighting on GCSEs. I told my parents I’m predicting to get like 6 7s and they keep telling me I can’t go into dentistry especially not ones like KCL
Overall, worst case scenario 998888777776, and best case scenario 999988777776, since KCL is gcse heavy if I get 998888777776 should I resit 3 of my 7s to get 999998888776, will KCL use my resit results? And will resitting them disadvantage me?
Btw I have no reason for underperforming the first time - I just didn’t revise effectively