Honestly guys, is 70+ average in your law marks enough? provided you've written a good cover letter and some work experience.
If you want in at the big 6, I would say you need an average of 76+. That said, a poorly written cover letter will screw you over. I think when you get to July you need to make a judgment call:
* If you have an average over 76, a balanced CV, and fancy your ability at writing a great cover letter, apply for the big 6 and a few mid-tiers.
* If you have an average of 70-75, a balanced CV, and think you can write a sound cover letter, apply for mid-tiers and maybe a few 'lower-end' big 6 firms.
* In all other cases, apply based on whether you think you have a reasonable shot at getting a job at the firm you want to apply for. Of course, just because you have a 76+ average doesn't mean you have to apply for a big six. Apply for jobs where you want to work and think you could get a job at.
The above may sound harsh, but it's important not to kid yourself. You need to be aware of your own strengths and weaknesses. I like to play soccer in my spare time, for instance, but I've never entertained the thought of going professional or playing for Australia. So why waste my time turning up to try-outs for Sydney FC?
The worst thing you can do is apply everywhere; being selective means you can produce higher-quality applications, and increase the likelihood of being employed.