Hello,

Generally admission for undergraduate courses commence after the results of 12th standard are out in the month of May-June, but  as this year due to covid pandemic entire academic schedule was revised which has greater chances of impact on the next year admission process, so you have to wait for the official notification regarding this for whichever college you want to take admission, if everything happens as per the usual schedule then there won't be delay in next year admission process, but  as of now it's tough to predict anything, nevertheless you enquire about top BCA colleges in Kolkata and Orissa which are as follows;

• University of Engineering and Management, Kolkata
• Maulana Abul Kalam Azad University of Technology, Kolkata
• Institue of Engineering and Management, Kolkata
• Narula Institute of Technology, Agarpara
• Brainware University, Barasat
• Guru Nanak Institute of Technology, Kolkata
• Centurion University of Technology and Management, Paralkhemundi
• Shiksha O Anusondhan University, Bhubaneshwar
• Kalinga Institute of Industrial Technology, Bhubaneshwar
• Utkal University,Bhubaneshwar
• Sambalpur University,Bhubaneshwar

You can also check out entire list of BCA Colleges of the two states by visiting the following link;

West Bengal; https://it.careers360.com/colleges/list-of-bca-colleges-in-west-bengal

Odisha; https://it.careers360.com/colleges/list-of-bca-colleges-in-odisha