How to rectify?

Make Rectification U/s 154 after receiving 143(1) Notice.

Technically there is no option to rectify. 

You can make an application to your Assessing Officer in writing about the mistake with supporting documents or proofs.

Ignore the mistake and wait for assessment and then go for rectification. AO may consider tax credits based on Form 26AS which is linked to PAN on his own. 

You can claim that TDS in the next years return.....You just have to write year of deduction in current years return ...they will accept previous years TDS as you haven't claimed it before

Regards,

KRISHNA ASHARA