Objective and completion tests in "O" level science /
Clarke, Ernest.
London : Murray,
1970-1971.
In folders.
Folders B1-B10 and C1-C10 hold 20 duplicate copies of each set ; folder for Biology 13 has only one copy of tests B11-B20 ; folder for Chemistry 12 has only one copy of tests C11-C20.
Biology 1 - Biology 20. -- Chemestry 1 - Chemistry 20.