It you who have to learn, when and what and have everything here that can help you.
And if you want any specific book can go to Bookstall and ask the same you will get many.
Best of Luck
I would suggest that you should first go thru all the bare texts of all relevant Acts. To mention a few:Industrial Disputes Act,1948,Industrial Employment(Standing Orders)Act,Contract Labour,1972 etc.
For detailed study of case law in ID Act,read Commentary
by Mr.O P Malhotra.