Your chance of getting admitted is even low and same as the payment.
If you want to become an officer in the army then you should not apply to the army with shs certificate. It is better to apply with a diploma or degree. Shs graduate apply as recruit and therefore do not hold officer positions. To get into higher positions in the army you have to first request a study leave which you can get irrespective of your rank. Further your education and then come back to the army.