Work Experience after submitting UCAS

how much does work experience boost my application as an international student? If I manage to get some, how should I notify universities about it? sending a direct email? (if so who, admissions or the department?) or should I email UCAS? thanks!

What subject are you applying for?

Are you talking about paid work or unpaid placements?

The value in relevant internships will be in reflecting critically on them in your personal statement. It's unlikely that your choices will let you amend it at this stage, but you can always contact them to ask.

applying for law, and im talking about unpaid placements, like unpaid internships.