Before being able to answer, I think it would be useful to know what this would be for?
If you’ve never had an issue, then why are you interested? what are you being encouraged to do Lvl 2 for? Who is encouraging you?
For example, are you planning to go to university? Or need this for work? Or something else?
If you need this to apply for uni, then you may need to contact UCAS or the university directly to see how this grades translates into their equivalents eg. GCSEs and what that may mean for UCAS points too, to meet the entry requirements/criteria.
If you already have a degree, and want to go on to a postgrad, then doing this I don’t think would make a difference because you would have an undergrad degree and they wouldn’t needs grades from your school days.
Likewise, I can’t see how this would make a difference in applying for jobs or any career. By now, I’d assume you would have enough life or work experience that your CSEs wouldn’t matter or make a difference.