Dear Azaman,
First, Don't need to go to consultant. Try yourself by the following links. For Quebec, you have to attend TEFaq / TCFQ exam ( Like IELTS in English). It is a French competency exam. Furthermore, you can contact with Alliance Francaise regarding French Lesson as well as French exams. There are two Alliance Francaise in Bangladesh, one in Dhaka and another in Chittagong. Only they take this exam. check the following links concerning Quebec immigration:
http://www.immigration-quebec.gouv.qc.ca/en/informations/applications-receipt.html
Only God will help us.
Robin