Hey there
Whilst I cannot speak from personal experience, I have two friends currently doing a combined law/science degree (one of them in their second year, the other in their first). From what I've gathered, the second year student is thoroughly enjoying it (even if he finds it a bit tedious at times, just like the majority of law students). I wish I could speak about the first year student, but like me, she has only just begun her law degree ^.^ (I've combined mine with Social Sciences)...
In my honest opinion, I would recommend you do the combined science/law degree (because if you are rather passionate about both your degrees, your interest in your units will make them easier to study
), and as izzy88 mentioned above, why not just do that extra year and come out with the two degrees instead of the one? (which will happen if you go to UTS and study for 4 years) It'll make you appear much more qualified to future potential employers
Plus, at some unis, you can drop out after three years if you find that law isn't for you, and you'll still receive your other degree (in, this case your science one). However, that may only be at UWS (and like many, I am sure you don't want to go there
... I do though, and I don't regret a thing), so you might want to make further enquiries in regards to that
And regardless of what uni you do end up going to, lecturers are always willing to offer their help (as long as you make the effort to go and see them out of class) ^.^. And in regards to you being 'called on', if you are meaning in the sense of lecturers specifically aiming a question at you, from what I have gathered, this doesn't happen (well, so far it hasn't, I've only just begun, so in this regard I'm clueless). They usually adress the whole lecture theatre, and if nobody provides an answer (which someone usually will), the lecturer gives one anyway
Also, if you are a bit shy, most universities offer a first year law camp before uni starts. So if you are not the most forthright person (like myself), you will find this extremely helpful in plucking up the courage to talk to your fellow law buddies
(or at the very least you will begin to recognise familiar faces before you even start your degree
)
Anyhoo, enough rambling here... best of luck with your decision
and I am sure many other people on here will offer more helpful advice than what I provided ^.^