Hi

Since you mentioned you are currently pursuing b.com and HV plans to go for mba, I will like to suggest you to do some internships to get hand on experience rather than some side courses. Internships are a great opportunity to learn you will face the real life work circumstances and problems it will be a good source of experience in your chosen field.

Answering your real question you can go for English speaking courses, some computer programming courses, foreign language etc

All the best