ESIC is a Central Government job and once your documentation process is over, you may be called for the final process ie the medical - interview subject to your clearance from the police - personnel from your own area. Such a report from the Police may take time ranging from a month or two. Once the organisation gets your Police - report devoid of any adverse comment against you, you will be intimated to turn up for the Medical - interview on a date specified for it.
In the medical interview, the medical team would examine you on different aspects such as colour blindness, colour - vision, Height, weight and other medical conditions such as sufferings from Diabetese, High Blood Pressure or any other diseases restricting you for the selection. However, free from any such abnormality with respect to your health, would mean you are completely fit physically and mentally to join the organisation within a period mentioned in your joining letter.
Yes, the job is permanent in nature and so far the leave is concerned, you can avail CL leave granted by the Organisation and other leaves will follow once you successfully complete the Probation - period.