You let me know how to study
这是想说明他教会你学习的技能还是学习什么知识?
我觉得这样表达更好：You coached me to improve my learning skill.
If you tell me the more for studying,the higher store I will get.
You are my good friend.And you are my teacher,too.
我觉得这样表达更好：You are not only my good friend but also my teacher.If you tell me the more for studying,the higher store I will get.这句话是如果你告诉我更多关于学习的事，我会得到更高的分数。不知道对不对。这是我向我们班学霸写的感谢信，感谢他教导我关于学习的东西，不是感谢老师。If you share more learning approach, this will be great value to me.