1) Start packing
There is a lot more to do on this point than you would have realized. Check the packing list here.
2) Start training
This helps you avoid PTP, saving 8 weeks of your time. And even if you do manage to avoid PTP, you will need to be quite fit because there are some tougher requirements in IPPT which you will need to meet if you want to go command school. Furthermore, you won't have that much time in BMT to get yourself in shape.
3) Get excited
This is very important! If you can get yourself interested in what will happen, you will find BMT a lot more enjoyable. I suggest watching Every Singaporean Son.