Step 1: Define "educational guidance" broadly.
It means the full range of help a school gives a student to succeed in study and plan ahead, not a single fixed task.
Step 2: Check each listed service against that definition.
Subject choice, career direction, and exam preparation are all standard components counsellors and teachers cover under this umbrella.
Step 3: Choose the option that keeps every genuine component.
Since none of the three services can be dropped without under-describing the term, they must all be included.
Final Answer:
"All of these" correctly reflects the full scope of educational guidance.