It's difficult to say definitively whether you can rejoin your B.Sc. Neurophysiology program after discontinuing the first year in 2019 without more information. The best way to determine your eligibility for rejoining is to contact the Registrar's office at Vellore CMC. They can access your student records and university policies regarding rejoining after a break.

You might also want to get in touch with the Department of Neurophysiology at Vellore CMC. They can provide insights specific to the B.Sc. program and any potential adjustments needed due to the time gap.

Having a clear explanation for why you discontinued the program in 2019 might be helpful during your conversation with the university. Try to find the university's policy on rejoining discontinued programs. The Vellore CMC website or the Registrar's office might have this information. Some universities have a time limit within which students can rejoin after a break. Knowing this will help manage your expectations.

The university might require you to start the entire B.Sc. program afresh, considering the significant time gap. They might suggest alternative options like diploma programs or certificate courses related to neurophysiology, depending on your P.G. diploma and current goals.

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I hope it helps!