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If you have joined recently and not liking it, the best would be to leave during the probation period. Look inside your contract, generally it is first 3 months. During which you don't have to serve any notice, however, if specified, you may have to pay the penalty charges depending on contract. Bear in mind, you don't have to pay any visa charges or so.
If you are looking to change employer, within first year you can't do it so without permission of current employer.
So it is much more dependent on your contract, read it thoroughly, if required take help of legal person/lawyer dealing with such issues regularly. You can also search online for Bahrain Labor Law and refer to it.
Hope this helps.

Okay..so if I'm not finiding it comfortable after my probation or so,can I post my resignation by serving two months notice,may be after a few months?

Go and read this:

/forum/viewtopic.php?id=841333

I have a Bahraini employee who resigned midway to his 1st year contract before he starts production of what he has been learning and training for; he is asking for a letter of service as well.

What can the company impose on him?

Already answered on your other thread

company not givi me weekend what can i do on this situation its been four months and its keeling me worrking for 12 hour every day i dont know what shoud i do iam affraid what if biss send me back to my country

You can raise a complaint.