Final answer:
The student is indicating that despite being proficient in English, their first language is Nepali.
Step-by-step explanation:
The sentence uses the word 'although' to show a contrast between speaking English well and having Nepali as a first language. 'Although' is used to introduce a subordinate clause that presents a different or contradictory idea to the main clause. In this case, the student is indicating that despite being proficient in English, their first language is Nepali.