Dear Akshay Patil,
You have not mentioned in your post what type of training is provided upon joining the company, its duration, whether mid-training tests are conducted, and the final examination at the end of the training.
Whatever the poor performance during the training may be, you need to pay the minimum wages as applicable.
Is it mentioned in the appointment letter that part of the monthly payment will be linked to the training performance or the grades obtained in the training? If yes, then and only then can you link the monthly salary to the training performance. If such a clause is inserted, the trainees still become eligible to receive the minimum wages.
Thanks,
Dinesh Divekar