I'm familiar with reading and writing, while lacking of practice of listening and speaking. However I do always have the faith to improve them whenever needed.
其实可以用很简单的一句解决的 Sorry, but I'm not so good at oral English as I am in written, which I've got lots of confidence in improving quickly. (或者更简单的 I'm a fast learner.) 不过鉴于楼主都不知道 case insensitive 什么意思还是建议回去多花时间学一学, 这是可以受用一生的技能.