Sixth Form is a vehicle for learning and gaining qualifications. Those qualifications could be GCSEs (if you're retaking them), AS levels, A levels, BTECs, or a variety of other qualifications.
Those different qualifications are taught and assessed in different ways. People also vary in their perception of difficulty, and that might also vary with subject and by type of qualification.
So one person might find a BTEC in Applied Science easy but an A level in History hard. Another might find an A level in French easy but a BTEC in Computing hard.
As a result, your question is impossible to answer in the general case.
Are you doing GCSEs right now? How have you found them so far?
Sixth Form is a vehicle for learning and gaining qualifications. Those qualifications could be GCSEs (if you're retaking them), AS levels, A levels, BTECs, or a variety of other qualifications.
Those different qualifications are taught and assessed in different ways. People also vary in their perception of difficulty, and that might also vary with subject and by type of qualification.
So one person might find a BTEC in Applied Science easy but an A level in History hard. Another might find an A level in French easy but a BTEC in Computing hard.
As a result, your question is impossible to answer in the general case.
Are you doing GCSEs right now? How have you found them so far?