Hello. You have not mentioned your academic level or specialization. Anyhow, you should consider a correspondence, online, or certificate course from a recognized university. Such courses are mostly short lasting between 3 months to a year. Examples:
- Commerce – Executive MBA in Banking Management (1 Year, Correspondence) offered by many institutes.
- Sciences – Smart Professional: Java (12 months, residential – 3 days a week) provided by Aptech.
- Law – Master Certification on Corporate Contracts (3 months, online) offered by IALM Academy.
Like the above, there are many courses available for both 10+2 pass-outs and regular graduates.
A short-term course will also allow you to work part-time. This will be useful for career expansion and future job prospects.