hi smit , class tests r never any marker of d preparation of jee , but ya des tests give u confidence u need to study more harder .So u needn't worry abt ur class test but try to do better in ur next exams.. Reagarding study tips, i wud suggest u dat u needn't hav to study more but make it regular as it will help in shaping ur preparation at a gud level , n always study no longer dan 2 hrs at a time or it may be better if u decrease ur study period as 1 hr. n take a rest for some time n again sit for study .And since now jee is objective type, it wud be better if u remember as many formulas as des will increase ur speed in exam..Also in math part when u solve problems by urself at ur home, give some time thinking of a possible short method , or any objective tricks by which u can solve dat problem quickly rather going by a traditional way.... wishing u luck for ur future exams..