User Login Codes Using VB And Access?

I wrote some codes for student login. the codes checks for the "username", "password" as well as their type of "status", from the database. once this input are met, the student logs in successful, otherwise a message pops up.The problem i encountered is this, i have 11 student records in my database and only the first 6 students can login successfully. the remaining 5 students cannot login. Despite entering the correct username, password and status for the last 5 students in the database, the message "Invalid username and password" comes up. I don't know where my code went wrong or maybe i didn't write the right codes to accept all student records as well as new ones.

Here's my code for the login:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click

[code]....