My understanding is some schools don't offer phy, Chem & Bio for GCSE, insteadthey offer the integrated Science referred to as Science GCSE; Single Science at foundation level and Double Science with more coverag preparing those with interest to student A Level Phy, Chem & Bio.
Should let him choose drama and geography if he has interest. Geography has field trips which borden their horizon. Drama trains their confidence in front of people which is also good to take at GCSE level.
What other GCSEs is he thinking of choosing?