I am 10th passed 2014 and I am appearing this year class 12th can I sit in advance 2018?

Hi

Yes, you can appear in JEE Advanced but only if you clear JEE Main with ranks upto 2,20,000.

You can check more about JEE Exams from the links given below:

JEE Main 2018

JEE Advanced 2018

You are eligible for JEE Advanced if you fulfil below eligibility criteria

1- To be eligible, the candidates should have been born on or after October 1, 1993. SC/ ST and PwD category candidates will get a relaxation of 5 years i.e., they should have been born on or after October 1, 1988.

2- The candidates should have appeared for the 10+2 (or equivalent) examination for the first time in either 2017 or 2018. However, those candidates whose 10+2 (or equivalent) examination results for the academic session of 2015 – 16 were declared after June 2016 will also be eligible for JEE Advanced 2018.

To check the complete eligibility criteria you can refer below link

JEE Advanced Eligibility Criteria

Good Luck!!

Ya sure but only after clearing v JEE Mains