I STARTED A DIET 3 DAYS OK. IS THIS IS GOOD DIET?

hi, im a female turning 18 on feb.22nd. im graduating in may and i really need to loose around 20-25 pounds by may. i weigh 155, and my weight has been bothering for like the longest time. so on Feb.9/10 i decided to go on a diet but i would like to share my diet with you and share with you what i ate and i need to know if i will loose weight by doing this. So first of all, in the morning before i go to school, i drink a cup of Green tea, than at lunch time which is at 11am for me, i would most likely eat a teriyaki sub from subway with peppers, onions, green peppers but NO Mayo. than when i home from like around 3pm. i would eat a tortilla with tuna in it than at 5pm i go on my treadmill for 30 Min's and after that i drink water than i don't eat AFTER 6pm. BUT IF IM hungry after 6pm, i would eat a fruit or so. would i be able to loose weight if i continuing doing this everyday?