1. une école is for students aged and is like an american school.

un collège is for students aged and is similar to a school.

un lycée is like an american school.

2. preposition à means to, and in.
à + le changes to:
à + la stays and à + l’ stays .
à + les changes to:

1;
Une école is for students aged 6-11 (I've heard some people group it 2-11) and is like an American elementary school. Un collège is for students aged 11-15 and is similar to a middle school.
Un lycée is like an American high school.
2;
à is to, in, at.
à + le is au.
à + la = à + la    à + l' = à + l'
à + les = aux
(These rules are similar to de.)

The first one is false the secound one is true the third one is false. the fourt one is false number five is true. the six one is true