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It's tough to give a single "best" 1-year course for a guaranteed high salary, as it depends on your skills, interests, and the job market. However, some consistently in-demand fields noadays with potential for high earnings include:

• Data Science/AI: These fields are booming, with roles like Data Scientist, Machine Learning Engineer, and AI Specialist offering excellent salaries. Look for specialised programs in these areas.   
• Cybersecurity: With increasing cyber threats, cybersecurity professionals are highly sought after. Certifications or diplomas in cybersecurity can lead to well-paying jobs.   
• Project Management: Skilled project managers are needed across industries. A PMP certification or a focused project management course can open doors to lucrative positions.   
• Digital Marketing: As businesses rely heavily on online presence, digital marketing expertise is valuable. Courses in SEO, SEM, social media marketing, and analytics can lead to good opportunities.

Any skills-based job can pay well, irrespective of the gender. As one grows experience in the in-demand skills, the payout that they may get is unimaginable because several big companies remain in the lookout for people who can do their jobs and have expertise in these fields. Below are some top Science courses that one can pursue after 12th for high salaries:

• B.Tech/B.Sc. Computer Science: Strong foundation for software development and design, AI, data Science (high demand) and many more skills.
• B.E./B.Sc. Electronics Engineering: Expertise in hardware & software for diverse industries.
• Data Science/Machine Learning Programs: Helps to develop specialised skills for analysing vast data sets (growing demand).
• Biotechnology/Bioinformatics: Blend of biology, technology for healthcare and research (emerging field).

However, the highest paying jobs after 12th in India for girls are in the teaching line, medical, software engineering, pilot, research and civil services. These jobs not only pay well but also provide recognition.