How do I check connection issues before a ranked?

Gonna sound real stupid question... but I realize I often LAG (today quite bad) in spite of having checked numerous times my internet speed (which was not great but fine at 2 Mb per second). However, if internet speed is not enough on its own to ensure a smooth game, what else can I check? Presumably it may have to do with riot's servers and anything in between those and me... Can anybody advice me on this one? ...as you can see I am no technology geek. I just want to know before hand if I can go into a game (i.e.: connection is fine) or not (i.e.: connection is crap). Thx.
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