Thank you for the clarification.
For the Spring 2018 term, you will only get 1/2 of that Pell amount…not the whole $5900. Just FYI. And yes…for that term, you would have needed to complete the 2017-2018 FAFSA using 2015 tax year information.
For the 2018-2019 academic year, you would do the 2018-2019 FAFSA using the 2016 tax year information.