As you are looking for top and regular topics for GD session for recruitment of Corporation Bank for the post of PO, so here I am giving some best and regular topics:

Corporation Bank Top GD Topics

SBI Merger
India’s performance in Rio Olympics
Pokemon Go
NPA problem
Merging of rail Budget to Union Budget
Swachh Bharat Mission
Women Empowerment
Government subsidies
Greece Crisis
Surrogacy Bill
20 satellite in single mission
Ujjwala yojana
Monetary policy committee
E-commerce
One Rank One Pension
Doping
BREXIT
Insolvency and Bankruptcy bill
Ujala yojana
AFSPA
Startup india
Benami transaction bill
Repo rate decrease in the last year
GST
7th Pay commission recommendations
Make in India
Merger of other public sector banks
Fat Tax