Should I resit or drop my dream offer? *Help please*

I am a student who previously had an offer from UCL and KCL for ABB. I missed it by a few marks as I studied on the weeks a few days before and the exam and the grade boundaries caused me to
miss my grade merely.
I am retaking but I had personal circumstances that affected me, and with no teacher or tutor and not having my rescources and three weeks to study I feel I would get the same grade, as last year I had so many rescourses, I knew what I had to do, had teachers and still could barely get an A.
I have an offer again from both unis but I am scared if I mess it up this time round I wont get another chance as multiple resits are not good. Should I drop out of my exams and do it next year? I would rather not take the resit and get an bad/same grade than take it next year and reapply with a third resit, but I don't know if I'll be able to get in, but I assume it'd be better than reapplying after failing for the second time.
Thank you for any help.

Resit this year. You've come too far to give up now, this is just pre-exam anxiety kicking in. At least even if you don't get the grade you wanted, you can contact the universities on results day directly and ask them if there is any way you can get onto your course (e.g. there are people who haven't met their offer, clearing, foundation year, transferring from one subject to another). Reapplying a third time won't look good, since they've already give you an offer that you haven't met twice. There is a higher chance of them rejecting you next year than this year. Definitely explain your extenuating circumstances to them but for now, do not stress. Also, even if you get a lower grade, missing your offer by a few marks is something that you can explain to the university if you haven't already. The worst that can happen is you go to your insurance choice (assuming you have one) and if not, go through clearing if your heart is set on university. Rejection is sometimes redirection.
Good luck with your resits, I'm sure you'll do fine!

Would reapplying for a third time, despite resitting for the first time (I withdraw from exams this year) still not look good since I haven't officially been unsuccessful with my grades?

If you had applied and gotten your offer under the condition of doing your exams this year, they may well reserve the right to withdraw that offer if you don't do your exams this year.