Should i start trying!? plz help?

so ever sense 6th grade everything has been down hill from there i got kicked out of 6th where i went to and alternative school where i barly finished the year went on to fremont jr high down in mesa where i got kicked out had no where to go so went to ccr got kicked out so went back to the alternative noww im in 8th where i get kicked out again! back in the alternative noww im 9th grade where im about to get kicked out again!! should i start trying in school all my grades are below! 40 % even my P.E class plz help