No, actually. There are opportunities:How?
As long as Gaara is active, he can pass the test by bringing the unconcious bodies of the Sand Siblings with him - and he can trivially acquire two scrolls from weaker teams.
So we'd have to kill Temari and/or Kankuro - and beyond the ethics of it, removing a moderating influence on Gaara can't possibly end well.
The only alternative is to somehow incapacitate Gaara in a way that would last for the remaining time left in this exam - multiple days. Oh, and we have to do it in a way that doesn't rouse Shukaku.
This is a horrible idea on a huge number of levels.
1) Separate Gaara from his siblings. Neither he, nor they, have advanced tracking capabilities. Yes, he has that sand eye, but I am fairly sure it's quite limited. If he can be separated from them, and they can then be knocked out (and ideally tossed out of the confines of the forest), his team fails
2) Actually defeat Gaara. Right now, in the forest, is the best opportunity to do so. Because
a) We are not limited to one-on-one combat. We can fight him as a part of the team
b) We can retreat, potentially even leading him to a pre-made ambush site.
c) We have a large area of engagement, meaning we can use large scale summons.
d) We are not limited by collateral damage to the environment or spectators
3) Have his team disqualified. Destroy his team's scrolls (if they have two) and feed him fake one(s), or, if they only have one scroll, feed him a fake one from the start. Or swap the scrolls mid-combat if we can. They don't have seal specialists. They shouldn't be able to spot the different.