How to get Index of Top 3 in each Month from Multiple Sheets into Output/Summary Sheet

Hi,

I've a data in Sheets 1 & 2 and I want the Index of Top 3 Items from Sheet 1 and Sheet 2 in each month in output/Summary Sheet.

I've provided the Sample data and output in the attached workbook.

if Possible, concatenate the Index item with the item Value in output.

Appreciate you usual help.