If you have not made a tandem in the preceding 90 days, you’ll have to take an experienced jumper (minimum 100 jumps) on a tandem. You do not need an Examiner to supervise this.
If you have not made a tandem in the preceding 180 days, you’ll have to undergo full recurrency training, which consists of a full SOP and EP review, including a hanging harness test. After that, you’ll have to do one solo and one jump with an experienced skydiver in the front.
If you have not made a Tandem in the previous 2 years, you will have to undergo full ground training again, the same as the initial class you took, and then complete a minimum of three jumps, one solo and two jumps with experienced skydivers acting as students