A student in the twelfth grade, typically in high school, preparing for graduation.

बारहवीं कक्षा का छात्र

English Usage: The twelfth-grader studied hard to get into a good college.

Hindi Usage: बारहवीं कक्षा के छात्र ने एक अच्छे कॉलेज में दाखिले के लिए मेहनत की।