Hello Sanjay,
If you were to ask my opinion and if I were given to choose between Allen and ahaguru then i would undoubtedly choose Allen coaching because I have prior experience with Allen .
In my time of jee preparation i had taken Allen test series and i used to solve those papers on a weekly basis and they would give instant score on that. So, their test papers were a bit on a high level than the normal test series so in this test series you would get a bit low than the actual jee mains. By this you won't be even over confident.
The passouts from Allen are more in number than ahaguru. So, it's more trusted.
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