what is the difference between kvpy and nest exams?

KVPY..
(a) Stream SA: Students enrolled in the XI Standard (Science Subjects) during the academic year 2014-15 and having secured a minimum of 80% (70% for SC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects (Physics/Chemistry/Biology) in the X Standard Board Examination.

Students promoted through both the Summative Assessments-II conducted by the school and conducted by the Board are eligible to apply, if they satisfy eligibility criteria. If the students have obtained a letter grade in the qualified examination, they are requested to convert it into an appropriate % marks and fill-up the application form.

(b) Stream SX: Students enrolled in XII standard / (+2) during the academic year 2014-15 and aspiring to join an undergraduate program in Basic Sciences (B.Sc./B.S./B.Stat./B.Math./Int. M.Sc./M.S.) for the session 2015–16 provided they have secured a minimum of 80% (70% for SC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects (Physics/Chemistry/Biology) in the X Standard Board Examination. They must secure 60% (50% for SC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects (Physics/Chemistry/Biology) in the XII standard Board Examination before taking up the fellowship, if awarded.

(c) Stream SB: Students enrolled in the 1st Year of an undergraduate program in sciences (B.Sc./B.S./ B.Stat./B.Math./Int. M.Sc./M.S.) during the academic year 2014-15 and having secured a minimum of 60% (50% for SC/ST/PWD) marks in aggregate in Science subjects (Physics/Chemistry/Biology) in the XII/(+2) Standard Board Examination. In the 1st year final examination of B.Sc./B.S./B.Math./B.Stat./Int. M.Sc./M.S. they must secure 60% (50% for SC/ST/PWD) marks before taking up the fellowship, if awarded.

NEST
The National Entrance Screening Test (popularly known as NEST) is an annual college entrance examination in India, conducted for admission into the National Institute of Science Education and Research (NISER), Bhubaneswar and the Center for Excellence in Basic Sciences (UM-DAE CBS), Mumbai. These two institutes use NEST as a sole criterion for admission to their undergraduate programs. Also, the Integrated Science Education & Research Centre (ISERC) of Visva Bharati University has been using the merit list of NEST for admission into its undergraduate program for the last 3 academic sessions. NEST was conducted in 45 centers across India in 2014.

As of 2009, obtaining a seat in NISER has become highly competitive. From a total of 70,000 applicants nationwide, only 0.325% qualify for admission