Hello Aspirant,

Both IBPS PO and SBI PO exams will have a descriptive section along with the objective section. The descriptive test will begin immediately after the objective section so yes it will happen on the same day ie., on the mains exam day. The descriptive section will have both essay writing and letter writing questions for which you will be given 30 minutes to complete . The total marks for this section in IBPS PO is 25 and in SBI PO it will be 50. Both the questions will be usually based on current affairs, government schemes and policies, latest news, ethical subjects and more.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/jobs/sbi-po/&ved=2ahUKEwjTvPGn5JjuAhVQA4gKHdM_CEgQFjAAegQIBBAC&usg=AOvVaw0XFSmyioAqwCJt61uWC445&cshid=1610536654472

https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/how-to-prepare-for-ibps-po/amp&ved=2ahUKEwjBw-qz5JjuAhUFQd4KHReEApwQFjAAegQIAxAC&usg=AOvVaw35HcEjokk2YEyrVoOsc8Fi&ampcf=1

https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/ibps-po-exam-pattern/amp&ved=2ahUKEwjBw-qz5JjuAhUFQd4KHReEApwQFjABegQIAxAJ&usg=AOvVaw0CJNgmf2MxKJscdnKWNqwN&ampcf=1

All the best