what do u mean by 'check broadband speed' ? if just wanna see the speed,just do speedtest.net maa
btw,if maxis,just buy their mobile internet for rm2 for an hour.and try the speed via downloading etc.just to check if there is any congestion at ur area.if okay,just take the corporate plan.

but i dont know either prepaid broadband is different from mobile internet.because the latter one is using different APN which is unet .anyone here can clarify more?