buddy
when it comes to IIT test series you genuinly have only two choices-
FIITJEE
BRILLIANT bmat
both this institute have a provision to take the whole test series as correspondence i.e u can take the tests at your home.but thats of no use because then these institute dont give ur score,rank etc. and u also dont get the real exam experience which plays a huge role in an exam like IITJEE.
now,coming to the quality ofthe test series.FIITJEE asks questions those are way beyond iitjee level(so umay be very demoralised after the percentiles come out or u may score high %iles and be very confident abt ur success as u would have performed very well in a hard exam)
BRILLIANT sets a paper which is very near to the actual jee paper difficulty but less no. of students take b.mat so teh competition is easier than fiitjee.
ultimately u have to decide.always remember IITJEE,AIEEE........all these exams evaluate the relative performance of the students.sometimes u may sail through these exams with a 10% score and sometimes u may not qualify with a 70% score.