At the event booth, age 12 is the first age for a standard ticket. The starter already gives you age; write the branch that chooses the message. Use >= so 12 is included, not = (assignment).
age is at least 12, print Standard ticket; otherwise print Junior ticket. Keep the fixed age at 14 so the submitted program prints exactly Standard ticket and a newline.Temporarily set age to 11, then 12. The first should print the junior message; the second, the standard one. Restore 14 before submitting. The output check only sees the age-14 result, so these two runs help you test the other path and the boundary.
The comparison is age >= 12. Put one printf in each branch.