im moving to germany and i haven’t finished high-school yet

my family is moving to germany next year for work and i don’t know how im going to transition to a whatever the equivalent for a highschool is over there. we are planning on moving over the summer so i half about half a year to learn more german. my german isn’t the best but i can understand and form basic sentences and conversations, i was born in germany and lived there until i was about three and spoke it fluently but moved to the us and forgot it completely. now 13 years later i started to try to re learn german a couple months ago and its slowly coming back to me. im not exactly sure how school systems work in germany and what i can do for a hopefully smooth transition into it. i am in the 11th grade and have one year left of high-school. i have lots of friends telling me i should stay and finish the last year, i would if i could but i really can’t i don’t have any relatives here their all IN germany and have no other option but to move their with my family because of my dads job. i would like to know if the move is possible, how would i go about it, and where i can hire experienced private tutors for learning german preferably online.

im kinda scared i really don’t how this is gonna go or what to do, thanks for any responses😆