Hey
@RunnyBeluga
Unfortunately, we really can't help you out with this in any meaningful way. You're asking a question that could have literally hundreds of different answers. Given that the best we can give you is one hundred differing answers, we decide not to take these threads. We aren't opposed to your mission, it's just that we can't help you. The only way to answer these questions definitively is to have the drugs tested in a laboratory.
I will throw you a bone and say fake "Ritalin" (Methylphenidate) is probably a lot less common than say, fake "Adderall" (Amphetamine). It wouldn't make a lot of sense to produce a less-desired drug for sale. In general, anyone who is willing to buy pills from strangers is not going to be the type of person to hold back and say they'd prefer the "mild option".
If you're in the United States, I'd say it would be pretty uncommon to run into fake Methylphenidate compared to stuff like fake Adderall. Where are you located?