The only wy to become more decisive is by making decisions, evaluating the outcomes and learning from them. Start small, practice making minor decisions firmly and stick to them. Over time you will gaine more cofidence in your ability to make the right call.

There are many career options after 12th commerce. You could go for B.Com, BBA, CFA, CA, CS, and other professional courses. Depending on your interests and skills, you can choose between accounts, finance, marketing, HR etc.

History can be interesting as a subject but jobs are mostly in teaching. Political science and sociology have wider options in media, research, civil services and policy making. It depends on your interest and ambitions.

You should focus on key visual examples from each period. Make little paintings of Renaissance artwork etc, this will help you remember the style and context better than just reading notes. All the best!|