There is several tabs information given below that can be best suited for educational purpose. Pre-installed apps doesn't mean that they can't be used for educational purpose. Students prefer collecting the study material from internet is best option now a days.
1. Google Nexus 7 2013 (2ndGeneration)
Manufactured by Asus
1.5GHz Qualcomm Snapdragon S4 Pro Processor
Price Rs 20,999 for 16GB version
Rs 23,999 for 32GB model Wi-Fi connectivity.
Rs 27,999 for 32GB model
Apple iPad Air (iPad 5)
OS-iOS 7 operating system
Rs 35,999 for 16GB model with Wi-Fi connectivity
Apple iPad Mini with Retina Display (iPad Mini 2)
OS-64 bit architecture and iOS 7
Price-Rs 29,000 for the 16GB model
Samsung Galaxy Tab 3
OS-Android Jelly Bean 4.1
Wi-Fi connectivity available
Price Rs 12,000
Samsung Galaxy Note 10.1
Display - 10.1 inch
Price in India:Rs 49,990
Nokia Lumia 2520
Qualcomm Snapdragon 800 processor
Windows 8.1 RT platform.
6.1 MP camera
1GHz single core processor
4GB of internal memory
Micro USB 2.0 slots.
price at 11,499 & 9,999
7" capacitive touch screen display
Cortex Dual Core 1.2 GHz A8 Processor
512 MB Ram
Price Rs. 6,490.
Cortex A8 (1GHz) and 512 MB DDR2 memory.
Display -10.1? TFT LCD
Internal memory - 4 GB