The Engineering Paper 1 in UPSEE examination is a total for 600 Marks. To qualify the exam generally you require 25% Mark's that is 150 marks . As your reservation category is SC ,you need 20% marks to qualify the exam that being 120 marks.  So any category you be in, you are eligible to qualify the UPTU entrance. Although being qualified doesn't mean that you will get a seat in government colleges for sure.