Answer:
I would advise him to associate the information of the subjects he studies with his personal situations or objects.
Step-by-step explanation:
The principle of encoding specificity explains that you can memorize concepts and information more efficiently if you associate them with personal things and situations that are striking to you in some way. For example: so that you can remember that a carbon atom can make up to 44 bonds with other atoms, you can associate this information with the name of your friend Cole, which has four letters.
Therefore, if a friend of yours is not able to get good grades in a subject even studying every day, you can advise him to associate the information he studies with personal objects or situations, based on the principle of encoding specificity.