Advice on how to study, a complete UPSC Beginner..

Hi all!, So I am a BTech 2nd year student but I have always had an interest in Civil Services, I am doing BTech cause yk parents...

I would like someone to guide me on how to prepare for this exam especially because of vast syllabus, I don't know what the best methods for preparation are.

And lastly I have currently taken an online foundation course from KGS, as I thought it could help me get structure on what and how to approach each subjects (and it was not very expensive), Till now I am finding their lectures to be quite useful though I don't have much knowledge about teachers and teaching quality in this domain.

Also offline coaching won't be possible to me so online sources suggestions would help a lot here...

Thanksss :))