Can my 13 month don’t switch to full cream milk? Can she continue to drink formula milk?

My boi been on FM this whole time since he stop on BM no long at his 1st bday,school stopped giving Formula changed To UHT mini pack his not taking it ever at home try to cheat him it his usual milk he know it not the taste he rem it to be so it up to u and ur lo,l still give my boi his milk powder every night 300ml