Hi aspirant, since you have 300K rank in JEE mains and 20000 SC Category rank so based on this let me tell you that there are less chances that you can get into HBTU on this rank if if somehow you get HBTU than it is sure that you have to compromise with the non willing branch in the institution. So you may give it a try for admission there but keep side look on the other colleges as well.

Good Luck.