CBSE

Dear Mohit,
Specialize in a domain that you find interesting rather than what's in demand. Do not bother about jobs just yet. You should rather focus on gaining a quality education. However, answering your question, visit this link: https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-k-shortage-occupation-list.
In short, occupations in the STEM category are in demand so you may consider courses that relate to this categories-Science, Technology, Engineering and Mathematics. In order to apply to UK universities, you would require the following set of documents:
1. Class 10th and 12th mark sheets
2. Two recommendation letters from your teachers on school's letterhead duly signed and stamped.
3. An essay about yourself as a personal statement
4. Passport copy-Front and Last page
5. IELTS score of 6.0
Hope this helps.