娜子姐姐:您好!我一直有许多烦恼,但不知道向谁倾诉.我的姐姐学习成绩优秀,而我并不像她那样.因此,爸爸经常批评我,还总是拿我和别人比较.我的学习成绩忽上忽下,很不稳定.我感觉这是因为没有好的学习方法.您能给我提供一些有效的学习方法吗?希望您能尽快给我回信,谢谢啦! Nazi sister: Hello! I have been having many troubles, but I don’t know who to tell. My sister has excellent academic results and I’m not like her. Therefore, Dad often criticizes me and always compares me to others. My grades are ups and downs, and I am very unstable. I feel that this is because there is no good way to learn. Can you give me some effective ways to learn? I hope you can reply to me as soon as possible, thank you!