Hi

You have done 10th in 2017 - 2018.

So,

In case, if it's asking for academic session then fill 2017 - 2018.

But,

If it's asking for the year in which you have passed 10th ,

Then,

Fill 2018 as 10th passing year.

This is because,

You have pursued your 10th in academic session 2017 - 2018 means you would have just entered 10th in the year 2017 and in the year 2018 you appeared for 10th board examination and qualified it , in short you passed 10th in 2018.

Thankyou