linked list in C

typedef struct
{
char fname[30];
char lname[30];
char MI;
}stud_name;

typedef struct
{
unsigned long idnum;
stud_name name;
char course [10];
int yr_level;
}studtype;

typedef struct
{
int grpnum;
char subj[24];
int time_sked;
int day;
int units;
char rmnum;
}
class_sked;