Hey!! I completely understand how you feel; my English teacher (who was teaching both my Extension and Advanced class) went on maternity leave last year so I got replacements for both classes (with 2 different teachers). I was devastated because not only did the class have a great relationship with her, but we connected on a personal level. She helped me so much with some shit that I was dealing with at the time, and honestly in short she was just incredible at listening to my problems AND teaching. When she left, I gave her long hug, expecting everything to go bad once she was gone. For Advanced, the teacher we got was honestly incredible, and SO SO knowledgeable. She's in her thirties as well like my other teacher, but she's had 12 years teaching experience and has taught multiple state ranking students (including a student who ranked 1st in Standard English). My main concern was that my new teachers wouldn't be as strict as my old teacher, because for me, this indicates that they're a good teacher and motivates me to actually do the work. Thankgod my new Advanced teacher had the same expectations as her, if not higher. For Extension, on the other hand, I got the sloppiest teacher ever and it did not seem like she gave a shit about even teaching the class properly to be frank. It was like she treated us as something "to do on the side". She also never checked homework, which was annoying and slowly contributed to my loss of motivation in that class. So, as a result, I've learnt that the first few weeks can be a bit tough at the onset of the transition; but generally after that it'll probably be better than you think. Don't hold onto preconceived notions. There is always a chance the new teacher is terrible, as I've experienced, but ultimately it's what you make out of what you have that counts.