Hello there. Hope you are doing good. I would like to tell you that the sections in all these competitive exams are somewhat similar but the level of difficulty varies in each exam. Like in bank PO exam, the quantitative section consists of higher difficulty level questions as your calculations are analysed better through quant section. If you can manage to prepare for all these competitive exams simultaneously, then it is well and good. Otherwise, it is advisable to you to focus on one exam as it will be able to produce better output since you will be following one pattern only.

I hope you found this answer helpful. Good luck for your future.