ITR 2 does not give exemption to LTCG for shares below one lac.

I filled Sch 112A with share transaction .Shares were purchased before Jan 2018. 13000 ₹LTCG was calculated. But it was transferred to CG schedule 4a and 10 % tax was levied. How to get the exemption u/s112A in ITR 2 in AY 20_21 ? Please guide me.