Firstly - no, we don't have gender equality. Anybody who says we do needs to do a little reading about the benefits of both genders - and if they're still convinced we have it, do some reading on the non-binary. Below is a few paragraphs with some tips to possibly improve your speech, for safety I've spoiler-tagged it.
Whilst I've done my best to not let any triggers into this paragraph, I cannot promise you will not be distressed whilst reading it if you have been sexually abused. I have not written of any scenarios in detail, but rather the effects that come from them. Proceed with caution.
If you're writing a speech on gender inequality (or any issue, really), you need to point out the things that AREN'T expressed all the time. Otherwise, those that are sitting there who know about it will think, "yeah, I've heard all this before, whatever", and only those who aren't learned will get a "wow" in there. Of course, most people in our generation know a lot about gender equality - really, the only things people might not be aware of is social sexism. Things such as "women make 70% less for working the same job" and "men's competitive sporting is paid more highly than women's competitive sporting" are on the radar of most people. The fact that a woman is a "slut" whilst a men is a "player" is mentioned so much. However, notice how it's bad to be a female dog, but not a male dog? What's up with that?
Abuse statistics work, but if you can, try and get representatives to stand up so that the audience can clearly see what's going on. Maybe bring up some often surprising facts, such as how often those under abuse get pleasure out of it - how they endure further torment, because no matter how "wrong, degrading" and "dehumanising" it felt, it also felt "good". Further on this, how phrases such as "it's not rape if you enjoy it" suddenly make rape seem okay, when it never is.
Another thing - what about men? Sure, people know that generally the wife wins custody of the children, but what about other topics that people might not even realise affect men? I recently read an article which detailed a person's continue sexual extortion and abuse of their partner, but phrased it so you'd think it was male on female abuse, only at the end to reveal the abuser was a woman. (of course, careful when talking about these scenarios, because you might cause a trigger for someone in the audience)
Something else you could mention is the recent "meninism" trend - a parody of feminism by a bunch of ignoramuses. Here's the tricky part, because this ACTUALLY brings back Emma Watson's speech from the UN. Because #menimism is so stupid, anybody with half a mind is completely ignoring anything brought up - however, there have been some tweets where the issue pointed out is a serious issue. Of course, nobody cares, because "#menimism" (not that I blame them, at all). You can use this example to highlight the powerful point made in Emma Watson's speech, "the more we hurt one gender, the more the other gender will suffer".
Finally, really graphic scenarios are very good for putting a "holy shit" into people's heads, that follows the same risk as me simply giving advice (and why you're reading this in a spoiler-tag). Maybe talk to your school, ask if you can put a proviso at the start of your speech so those who want to leave for it, can. Hell, the simple fact that you need to give people the option to leave the room might even give you the "wow" factor you're looking for.