Unless your really bad it really shouldnt matter.
I was constantly being isolated (sounds like your internal exclusion) and at 1 point possibly had the mist isolations deffinately in my year! I was also exxluded twice, countless detentuons that i deemed pointless so never went, had more lunches took off me than i had i think and was on some form of report atleast once a year from year 7 to year 13... and still was allowed into the same 6th form, and teacher who didnt know me thought they did and knew that me, but not the me i became in 6th form.
Schools really dont send information on unless its really bad.
Youd never guess inwas that person in lower school now half way through my second degree at 32, i never let my behaviour and attitude stip me...