Hi  Vaishnavilogishetty...!

I hope  you're  doing  great...!

I can suggest you, that start with electrostatics. because you will come cross many things like about charges, quantization of charges, coulomb's laws and electrical fields etc...  and  current electricity mostly based on the application part of electrostatics and circuit problems. so, I would prefer to start with electrostatics.

And all the best for you're jee mains examination.