I received an offer from LSE this year for accounting and finance.Even though LSE was my dream uni, I actually didnt end up firming but instead firmed the PwC flying start degree instead as I wanted work experience integrated into my uni years as well as doing all but 3 CA exams.
My a levels were maths, chemistry and economics - I also did further maths but only for 6 months I dropped it as I felt I was falling behind in my other subjects causing my grades to fall.
I would say if youre dead set on doing AandF maybe only do 3 A-levels but focus on getting those predicted grades A/A* as this would be important for LSE. The combination isn't necessarily important aside from hacing maths. The ones you've mentioned are great,most unis have a desirable subject list so check those out.
My predicted was A*A*A , but please remember that LSE application also takes into account your PS and partually your GCSE grades. In particular your PS books, podcasts and online courses are really handy to put into it. For example in mine I mentioned listening to a podcast then this made me read this book to learn more etc.
If you need any more tips for A&F message me.