First of all we should motivate them to be confident and tell them the importance of english and tell them to observe their classmates when talking in english moreover ask them to speak english however they know gradually they learn english from their mistakes 

Firstly they should have  the self confidence and they should refer dictionary and speak english at home also .when they come across the hard words they should search the meaning of it and again  they should use that word by that they can be perfect in speaking english and listen to the english song with lyrics and practise some speches in front of the mirror and see the change they are perfect in english .hope u like it .