e muon hoi tai sao trong goi Toeic 300 cua e o unit 2 phan 3420 tu vung lai k co am thanh,den khi sang goi 500cung gap mot so tu tuong tu nhu vay?e cung k biet cac unit con lai co vay k nua?khong chi co the tai unit 11 goi 500phan bai tap GRAMMAR bi khuyet bai tap hoan toan,phan Reading cung the chi co 2 bai cuoi EX5.6 thoi, phan Listening thi may bai dau k co dap an,e lam bai xong chang biet check dap an o dau nua?e cung k biet tinh hinh nay la chung hay chi xay ra voi e????