University a Reality???

So I have some very good yet confusing (well to me anyway) news today.
I was given an early round offer for a very good university to do a combined double degree, Bachelor of International Studies / Bachelor of Law.
This is absolutely amazing because I never thought I'd make it into university considering how my schooling years ended. And I never expected to get into this course let alone receive an early round offer, especially considering the required ATAR is 95.9, and I don't even have an ATAR.
For all you confused non Australian readers out there i'll do a quick explanation of New South Whales (my states) education system.
After finishing primary school K-6 you start high school yrs 7-8 are considered juniour years.
Years 9-10 are your School Certificate years, wich is the minimum qualification needed to get into trade colleges and also the allowed drop out point. For people who choose to continue there's a further two years yr 11 and 12 wich are considered the HSC, Higher School Certificate years. I dropped out after my Preliminary HSC so never received a full HSC. Once you complete your HSC your given a ranking by UAC (University's Admission Centre) which used to be called the UAI (University Admissions Index) but was changed last year to a nation wide index called the ATAR (Australian Tertiary Admissions Rank). This rank dictates what course you can be accepted into at University.
I went from an A grade honours student to a barely passing flunky within a year, due to some serious issues I had in my life at the time, so I never finished my schooling and never received a ranking, I basically thought University was a dream I'd never get any more. So I started a trade and began to apprentice in Patisserie Chefing.
Thankfully I found out about a test I could sit called the STAT (Special Tertiary Admissions Test) that would be an ATAR equivelant offered by UAC. So I applied, and sat the two different required tests. I then applied for a multitude of university's, picking low level courses basically cause I thought its all I would be able to get into with a STAT as its not as good as an ATAR. Putting down Bachelor of International Studies / Bachelor of Law for me was done on a whim, I honestly didn't expect to be accepted for any courses so thought I may as well aim high for the heck of it.
I finally got my STAT results back, there graded from 100 - 200 and your given a percentile of how many people you beat basically, I scored 194 beating an apparent 96.7 % of applicants, I was incredibly happy, and so I got my hopes up thinking I might get into a low level Bachelor of Arts or something similar. Never ever did I expect to receive this offer.

But the problem is I'm now unsure if I want to commit to five years of study, for what is a rather rigorous degree, being a double bachelor. Both sides are very demanding, and the international studies side requires me to study at a foreign University for a Semester, add on top all the Law topics I have to complete it's quite daunting. So I'm thinking of accepting the offer but deferring for a year. That way I can get another year of perspective, hopefully travel and gain some more wisdom in life. And if at the end of this year I still want to study that course, then I'll do it. I'm just so unsure, I don't want to do it for a year and find I don't like it, because that's a lot of money and time to waste.

So do you guys have any opinions or insights for what i should do... it would be greatly appreciated

Adam xoxo