Step 1: Start with noticing, not fixing.
The first job is to spot a real pattern of change in the student, not to jump straight to a solution.
Step 2: Move to a private, supportive conversation.
A calm one-to-one talk, free of blame, lets the student open up about what is causing the stress.
Step 3: Bring in support where needed.
Adjust academic demands temporarily, then loop in parents and the school counsellor if the stress is serious or ongoing, rather than handling it alone.
Step 4: Protect the student in the classroom itself.
Avoid singling the student out, and encourage a friendly, non-competitive class environment while they recover.
Final Answer:
Notice early, talk privately, ease pressure, involve the right support, and keep the classroom kind, in that order.