TAX RELIEF 10(E)

I got some arrear for financial year 2017, 2018 & 2019 and as usual my employer deduct income tax on gross amount. As the income pertain to previous years some friend told me if I fill for 10 E then I will get some relief. No idea about this one, can anyone give me some advise how to do that and when and where  to fill form 10 E and how. If there is any article I can read and try to understand by my own. However seeking some help. 

Thanks. 

T K Ghosh