Hi guys, I've failed ICND1 for the second time again today

. Please could someone help me as I am lost on what to focus on;
The first time I took the exam I got the following:
Score: 650
Describe the operation of data networks 43%
Implement a small switched network 43%
Implement an ip addressing scheme 75%
Implement a small routed network 43%
Explain & Select admin tasks required for wlan 0% ( Missed this question out by mistake!!)
Identify security threats to a network 100%
Implement and verify WAN Links 40%
In my second attempt I got:
Score: 675
Describe the operation of data networks 71% (UP)
Implement a small switched network 50% (UP)
Implement an ip addressing scheme 58% (Down)
Implement a small routed network 36% (Down)
Explain & Select admin tasks required for wlan 100% (Up!!)
Identify security threats to a network 100% (Same)
Implement and verify WAN Links 40% (Same)
Guys any tips on how I can improve? I know for the WAN Links part I need to know about circuit and packet switched networks.
Please could you let me know what topics come (Example Questions) in the following sections;
Implement a small switched network
Implement an ip addressing scheme
Implement a small routed network
Thanks Guys