Do I have a shot at making varsity cheer?

My school's cheer team is one of the best in the country, having won several national titles. I danced competitively for the same school for a year and danced on my middle school's competitive team. Our dance and cheer are more similar than most, no we don't do stunting but we are required toe touches and hurtle jumps and the same motions. The only time I have cheered was for a rec leugue in elementary school, so I don't know if I will be able to pick up stunting on a level higher than an elevator. I am a good base but is it hard to learn to stunt if you have missed several years? And also I have about 8 months to attempt to get a series of back handsprings and hopefully a spotted back tuck; they take girls who don't completely have them but I have seen them work with the girls who almost have it. I just need to know any advice for learning the aspects of cheer that I do not know, like the higher lever stunting or tumbling. Is it possible to get most of the skills down?