Do you know that dressing properly for an interview can earns you those brownie extra points which will help you get that dream job?

Explanation

Here, the singular form of the verb 'earn' has been incorrectly used instead of pulral. Hence, the correcty usage would be 'can earn'. The gramatically correct sentence would read as: Do you know that dressing properly for an interview can earn you those brownie extra points which will help you get that dream job?