You should practice playing “You really got me” as well as read and understand all the variations of power chords.
Luke should practice “Cantaloupe Island” – focus on the repeating patterns. Use the same fingering throughout the chord changes.
Shaurya should keep on practicing “Cool Blues” as from the book. He should also play “Spanish Theme” as per written using the notes on the 1st.
Veronika should practice both lines – separately – of “Minuet in G”. She should use the right fingering on both left and right hands. Particularly the right hand should alternate between index and middle fingers, always leanning on upper strings.