If I pass in science exam so what usefull it will for me in AI engineering and UPSC

Passing a Science examination can be useful for both AI engineering and UPSC, but in different ways.

For AI engineering, Science—especially Mathematics, Physics and Computer Science—helps develop the analytical and problem-solving foundation required for engineering and programming. However, for admission to an AI/engineering degree, you must also satisfy the specific eligibility requirements of the course and entrance examination.

For UPSC, Science is also useful because science and technology is an important part of the General Studies syllabus. A science background can help you understand topics such as space technology, biotechnology, environmental science, energy and emerging technologies.

However, simply passing Science is not enough for either career. You should focus on developing strong fundamentals, mathematics/reasoning skills, computer skills and communication ability depending on your goal.