1)Can I pay at one time for one year membership of course hero materials or should I pay the annual payment every month?

1)Can I pay at one time for one year membership of course hero materials or should I pay the annual payment every month? 2) Once I pay the annual payment,can I get access for any subject of different departments or is it restricted for a specific subjects of specific department ? Please you let me know, so that I am ready to pay for one year membership of the course hero materials as soon as possible.I am looking forward hearing you soon.Thank you,Tadele M.