Having a nightmare time to the start of year 9. Never had any problems with school before now. No problems in any lessons or with work, but problems happening outside of these. Swore at a teacher and became really angry over an incident - happened on two occasions. Stern talk to at home and promises made not to happen again after first incident, happened again, not as bad as the first but not acceptable. No problem at home or outside with them, reasonably well behaved. Any advice?