Would physics, maths and history be a large workload?Watch this thread
History isn't particularly more work than politics or economics. Physics and maths together are probably slightly less than the workload of two less related subjects, because there's some common material.
Economics should be an easy A grade if you work hard and do past papers.
i did biology so i can't say much on history, but biology is one of those super heavy content subjects and i actually liked having something like this alongside maths and physics