If you have noticed an error on your BRP, you need to be aware of if you applied for your visa inside the UK or outside, as this will determine how you report it. If you applied for your Student visa outside the UK, you will need to report the problem within 10 days of it arriving. If you do not so after 10 days, you can still report it, but may need to pay a fee. If you applied for your Student visa inside the UK, you can ask for an administrative review.
In the first instance, you may want to get in touch with the International Student Advice Service for clarity on if there is an error on the BRP.