I think most students at some stage of there study will take at least two papers at one sitting maybe even 3 or 4. The only advice i can really give is it is much easier taking a numeric paper and a theory paper together e.g F7 Financial Reporting and F8 Audit. Don’t be shy to try two or more at a time even if you pass 1 and fail the other one, you just retake at the next sitting which you will only need to refresh yourself weeks before the exam. Good luck.