How can I clear prelims in 3 months?

So I am giving upsc for the first time and giving it to get comfortable with the exam, I wish to clear prelims and will be able to give good time daily to the prep for 3 months. I just want to sit for mains to see how the exam is like and what I need to be prepared for in 2027.

Any suggestions on how can I qualify prelims with 3 months of prep? Books suggestions and online free platform suggestions will be of good help too. Thanks!