Hello,
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Need not worry about lockdown, whole India is in lockdown. Coming to your preparation, ask the management of your college about preparation, because due to lockdown, most of the colleges are starting online class on particular applications. So, ask the college maybe there are planning for such thing's. Now, if they aren't doing, you have your own books for preparation right. Now, you can find many of the thing's on YouTube about doubt clarification, you can refer them.