how to actually excel in varc section i do daily rc challenge i dont feel like improving

You will have to read extensively. Read dense passages and solve previous year RCs. Read with focus for 30 minutes, 40 minutes without thinking of anything else. And read very slowly and understand everything properly. Do not rush or focus on reading fast. Read slowly and absorb everything you're reading. And while solving questions- Always use elimination technique. You should know why a particular option is correct and why others are wrong. And mentally summarize every paragraph you read.

i think first watch some lecture on how to approach an rc strategy. it is really helpful, speaking from personal experience. and the only other thing to do is practice. some days will be good, some bad. but daily practice will work 100%

try this: https://youtu.be/ozhEHygD3YY?si=UN7u89VUgZBs03Yo

start giving sectionals also start practising previous year rc . Do not rely only on percentyl try new and other type of dense rcs too improve your exposure to good rcs

first watch some lecture on how to approach an rc strategy. it is really helpful and then solve