If an internal job vacancies has come up that you wish to go for then you need to ensure that you are fully prepared for an interview. Many companies advertise jobs internal prior to advertising to the public so if you are looking to move up the ladder within the business, then this could be a great opportunity.
Firstly you need to consider if you have all the qualifications and / or experience that they require. If not, it doesn’t mean that you shouldn’t apply but you will need to give them confidence that you can carry out the required tasks.
Hopefully you will have proved yourself in your current position, as employers will use this as a major factor in deciding if they offer you the job. Making sure you are on time, complete work to a high standard and offer to go the extra mile when needed will look great to any employer.