CGP or MGP 2023

I will answer this assuming you are planning to choose between a foundation course or a test series. The point here is your current preparation level. if you have no clue, it is always better to take a foundation.

A good way is to begin with a Test Series, and in case you feel inadequate. you can always always your coaching to migrate you to a foundation program.

Note that from what I have experienced ( when people enter the final stage after clearing the prelims & Mains ) is that most people - who are smart enough to pick up stuff and do self study - are good with where we have defined sources such as Laximkant, but need classes for subjects where there is open-endedness such as GS Paper 4, Major parts of GS Paper 3, some parts of GS Paper 2, and GS Paper 1.

If you have the patience and resources, it is always better to go for a full pledged classroom program as early as possible and not when all time is lost.