Practiced on weak topics through questions

I was not very strong in QoS on a Wireless Network and Advanced Location Services while practicing for 300-430. However, i wanted to be sure of the topics and hence, opted to tackle them through the route of Cisco ENWLSI mock tests. The ones that i found online are awesome and they made me realize that i was already very thorough with some topics. Hence, i made an overall strong point by giving quizzes.