For lower secondary school parents can choose between the types of Oberschule and Gymnasium. For the enrollment you can specify three schools (first, second, third choice). If your child cannot be admitted to the school of the first choice due to lack of space, he / she participates in the admission procedure for the second or third choice school.
The online search directory helps to find the right school (https://www.bildung.bremen.de/schulwegweiser-3714)