A non prime attribute depends on composition of a partial Partial primary key and a non prime attribute. Is the table still considered to be in 3NF

Question

Here is the table descriptions:

Students

SID	SNAME
1	Adams
2	Jones
3	Smith
4	Baker

Teachers

TID	TNAME
60192	Howser
45869	Langley

Classes

CID	CNAME
IS318	Database
IS301	Java

Student info:

SID	CID	TID	Grade
1	IS318	60192	A
1	IS301	45869	B
2	IS318	60192	A
3	IS318	60192	B
4	IS301	45869	A
4	IS318	60192	A

SID and CID, Composite primary key. SID,CID -> Grade and SID,TID -> Grade.

Is the table still in 3NF

Answer 1

Not as far as I understand it:

A database relation (e.g. a database table) is said to meet third normal form standards if all the attributes (e.g. database columns) are functionally dependent on solely the primary key.

https://en.wikipedia.org/wiki/Third_normal_form

Since your attribute is not solely dependent on the primary key, then I think not.