Hi harsh . As your jee score is low I wont suggest you to take part in jossa counseling because you will get into some low level colleges as with 87 Percentile you cannot get admission into any prestigious institution like national institute of technology and indian institute of technology nor even in government colleges but a cording to your score in Acpc thats a good score for sure you can get government colleges in gujrat like DDU , Vishwakarma government colleges  as well as some deemed university like CSPIT who have good ranking . So i would suggest you to go through that and decline the conformation mail .

Hope it helps