I think Dash8' has a point. If AS level maths and physics are causing serious problems, you may find the ATPLs harder going than you expect, especially if going down the integrated route due to the intensity of the ground school phase. Saving up for 15 years to start an intensive course with a lot of maths and physics involved doesn't sound sensible. You'll be 15 years on from when you last studied either subject and, as such, find the ATPLs even harder. By then you'd also be in your mid 30s and fighting for jobs against better qualified, younger graduates, who may well have higher ATPL results due to their maths and physics aptitude.
You might want to just knuckle down and really work on the maths and physics while it's still fresh. Whichever route you take, it's going to be pretty important (notwithstanding any enormous changes in the ATPL syllabus).