Pursuining another course.

What is the procedure, for a CA. student.....when he is willing to take two or more courses from regular or correspondence ?

1.) when his articleship is going on ?

2.) when his articleship is completed ?

3.) If Form no. 112 is submitted before only for one course then how another form can be submitted for other course (for ongoing articleship student)

4.) When he did not submitted Form no. 112.