I am in the fight semister of degree.my result is expected on june 20.can I apply ?

Hey,
Since you are in fifth semester of your graduation,you can apply for CAT 2019 itself. See,   Final year students are also eligible to apply for CAT 2019 if you fulfil the criteria within stipulated time frame. The CAT scores are valid till second week of January,2020.
For detailed information follow the link given below:
https://bschool.careers360.com/articles/cat
Hope this helps.
Good luck.