No you can make corrections. Please visit the website.

No we can

Correction links open till 17th

https://www.neet2018nic.co.in/neet-2018-form-correction.html

Please visit this link to do the correction

According to the CBSE notification, you are allowed to make correction in percentage of marks obtained in class 12. Please read in detail NEET Application Form correction window to know what all can be corrected in the application form.