Optional subject change

I'm an aspirant just like you guys.

Now I'll come directly into the topic - I have been trying too swim to the other but been unsuccessful till date. Have given 4 attempts but couldn't clear prelims in any attempt which gave me some panic attack, so while I was analyzing the potential mistakes what I might have been doing I came to know that

1. I was not strong in subjects like history, & economy.

2. I stopped preparing for mains answer writing to keep full focus on prelims itself as my prime focus then was (pehle Pre nikalna hai, mains baad mein dekha jayega).

3. This eventually lead to leaving aside my optional subject.

Now luckily I got an employment opportunity through an other examination, now I'm very much eagerly waiting to restart my preparation again but thought of changing my optional as I have no idea what did I do in those classes. My previous optional was Anthropolgy but now thinking about Sociology, Philosophy, PubAd. Couldn't decide what should I take so I request Fellow aspirants here to guide me in this and also tell me what should be the topic should I read (in every subject) before I take a call.

It will be appreciated if you can also provide telegram links for accessing study material.