Sir can we clear jee advance by crash course ?? Beacause at now i am not able to pay for coaching

Crash course is generally for revision and not learning . If you have your fundamental clear and had studied it earlier, then it`s of worth. Because in crash course only a quick recap is there , and test series are focused upon generally. But you can check online portals like embibe , askiitians and my par . Also akash itutor is free and good.