Spreadsheets, Budgets & Capital Investment Appraisals r commonly found in this paper, these r the most important chapters where questions usually hit in exams. However, if ur thinking of taking this paper soon, i do recommend that you complete the full syllabus, as you may never know from where questions come from.
U can use both text books, but I’d go with BPP as question patterns are relevant with BPP revision kits.