Hi Amlan,
May be below format and attached format will help you:
Apprentice Offer Letter Format
Satyanarayana
(Address)
Dear Satya
Letter of offer for position of software trainee
We are pleased to inform you about the offer of internship at the position of software trainee. This offer rolls out the terms and conditions that are related with this position and is made with the approval of the trustees of the ministry and the trainer [name of trainer].
It is a full time position for a fixed term of one year commencing on 1st July, 2014. You have to work from Monday to Friday (Time) The training position will be evaluated on the completion of the first six months at the team review and will be open for termination by either party at that time.
As the position is a software trainee, your duties are listed below:
Duty and performance of duties
[Roles and Responsibilities].
You will also be required to undertake any other duties from time to time as suggested by the training team leader or trainer.
It must be noted that during the course of your employment, you will be dealing with lots of confidential information which will sometimes come from the trainer himself for teaching and training purposes. You must make sure that this information must not be shared with anyone. You can only share it with your trainer and spouse. You agree to keep this important information confidential both during and after the apprenticeship.