I have observed that the experimental kits of YashPlus Education, Akola are very accurate and work very precisely particularly for taking the readings in practical electronics.
So my advice is the go with these kits only so that the students of 11th and 12th vocational electronics will not get frustrated while taking the readings in any experiment. The kits are, as well suitable for the students of 1st year engineering studies.
Refer this link for more details about these kits. I will definitely recommend them for the schools and colleges for enriching their laboratories.