Here I am mentioning few top recommended CA coaching classes in Lucknow-

1. Sankalp Kanstiya Classes ( https://sankalpkanstiya.in/ )
2. Saraswati classes( https://saraswaticlasses.com/ )
3. Corptut.Com ( https://corptut.com/ )

You can search for them online and contact them for further details. Well I would suggest since lockdown, and you cannot attend offline classes for now, you must go and have a look at Corptut.Com, it's an online CA learning platform.