
die Schulklasse
school class
A group of pupils or students who are taught together in a school.
Die gesamte Schulklasse macht nächste Woche einen Ausflug ins Museum.
The entire school class is going on a trip to the museum next week.
school class
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school class
A group of pupils or students who are taught together in a school.
Die gesamte Schulklasse macht nächste Woche einen Ausflug ins Museum.
The entire school class is going on a trip to the museum next week.

classroom
The classroom, meaning the room in a school where a school class is taught. This usage is rarer than the meaning referring to the group of students.
Nach dem Unterricht musste er noch die Schulklasse aufräumen.
After class, he still had to tidy up the classroom.
The word is a simple compound of 'Schule' (school) and 'Klasse' (class). So it refers to a class that belongs to a school.
Nächstes Jahr kommt meine Tochter in eine neue Schulklasse.
Next year my daughter will be in a new school class.
The meaning 'group of students' is much more common. You can recognize the rarer meaning 'classroom' from verbs that refer to a room, such as 'aufräumen' (to tidy up), 'betreten' (to enter), or 'dekorieren' (to decorate).
Die Schulklasse fährt morgen nach Berlin.
The school class is going to Berlin tomorrow.
'Die Schulklasse' (the school class) is a collective noun. Although it describes a group of people, the noun is singular and the verb is conjugated accordingly.
Die Schulklasse lernt gerade über das alte Rom.
The school class is currently learning about ancient Rome.
class
„Klasse“ and „Schulklasse“ can refer to the same group of students. „Klasse“ is sufficient when the school context is clear; „Schulklasse“ explicitly names this context and prevents confusion with other meanings of „Klasse“.

Eine Schulklasse aus Köln fährt morgen mit ihrer Lehrerin ins Museum.
A school class from Cologne is going to the museum with its teacher tomorrow.
Unsere Klasse fährt morgen mit der Lehrerin ins Museum.
Our class is going to the museum with our teacher tomorrow.