$1.$ For a job application system

a$.$ Draw a context model. $[$Hint: identify the external process$/$entities$/$system$,$ and draw associations between them$]$

b$.$ Draw a process model for a job submission process by an applicant. $[$Hint: processes may involve: sign up$,$ log in$,$ check whether an account already exists during sign up $($decisive process$),$ check whether the applicant already has applied for the job or not, if yes, let them apply, and otherwise, etc$]$

c$.$ Draw a use case diagram. $[$Hint: Identify the actors, identify the functions $($use$-$cases$),$ and draw associations between the actor and use$-$cases$]$

d$.$ Draw a sequence diagram for viewing an application by a recruiter. $[$Hint: login$,$ queryDB, feedback from DB$,$ etc.$]$

e$.$ Draw a class diagram. $[$Hint: classes jobInfo, applicant, application, applicationStatus, recruiter etc$]$