Which is best phone ranging from 10k to 12k?

You can go for the redmi 3s prime in that price range. You will get that phone at aroubd 9k . Here are the specifications of that phone.

BODY

Dimensions 139.3 x 69.6 x 8.5 mm (5.48 x 2.74 x 0.33 in)

Weight 144 g (5.08 oz)

SIM Dual SIM (Micro-SIM/Nano-SIM, dual stand-by)

DISPLAY

Type IPS LCD capacitive touchscreen, 16M colors

Size 5.0 inches (~71.1% screen-to-body ratio)

Resolution 720 x 1280 pixels (~294 ppi pixel density)

Multitouch Yes

- MIUI 8

PLATFORM

OS Android OS, v6.0.1 (Marshmallow)

Chipset Qualcomm MSM8937 Snapdragon 430

CPU Octa-core 1.4 GHz Cortex-A53

GPU Adreno 505

MEMORY

Card slot microSD, up to 256 GB (uses SIM 2 slot)

Internal 32 GB, 3 GB RAM

CAMERA

Primary 13 MP, f/2.0, phase detection autofocus, LED flash, check quality

Features Geo-tagging, touch focus, face/smile detection, HDR, panorama

Video 1080p@30fps, check quality

Secondary 5 MP, f/2.2, 1080p

SOUND

Alert types Vibration; MP3, WAV ringtones

Loudspeaker Yes

3.5mm jack Yes

- Active noise cancellation with dedicated mic

COMMS

WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot

Bluetooth v4.1, A2DP, LE

GPS Yes, with A-GPS, GLONASS, BDS

Infrared port Yes

Radio FM radio

USB microUSB v2.0

FEATURES

Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass

Messaging SMS(threaded view), MMS, Email, Push Mail, IM

Browser HTML5

Java No

- Fast battery charging

- DivX/Xvid/MP4/H.264 player

- MP3/WAV/eAAC+/FLAC player

- Photo/video editor

- Document viewer

BATTERY

Non-removable Li-Ion 4100 mAh battery

But if i have to buy a phone , i would rather add 2k in my budget and get the moto g4 plus for 14000. It is the best phone under that price range. Here are some of its specs:

BODY

Dimensions 153 x 76.6 x 9.8 mm (6.02 x 3.02 x 0.39 in)

Weight 155 g (5.47 oz)

SIM Single SIM (Micro-SIM) or Dual SIM (Micro-SIM, dual stand-by)

DISPLAY

Type IPS LCD capacitive touchscreen, 16M colors

Size 5.5 inches (~71.2% screen-to-body ratio)

Resolution 1080 x 1920 pixels (~401 ppi pixel density)

Multitouch Yes

Protection Corning Gorilla Glass 3

PLATFORM

OS Android OS, v6.0.1 (Marshmallow), planned upgrade to v7.0 (Nougat)

Chipset Qualcomm MSM8952 Snapdragon 617

CPU Octa-core (4x1.5 GHz Cortex-A53 & 4x1.2 GHz Cortex-A53)

GPU Adreno 405

MEMORY

Card slot microSD, up to 256 GB (dedicated slot) - single & dual SIM models

Internal 16 GB, 2 GB RAM or 32 GB, 3 GB RAM or 64 GB, 4 GB RAM

CAMERA

Primary 16 MP, f/2.0, phase detection & laser autofocus, dual-LED (dual tone) flash, check quality

Features Geo-tagging, touch focus, face detection, panorama, auto-HDR

Video 1080p@30fps, HDR, check quality

Secondary 5 MP, f/2.2, auto-HDR

SOUND

Alert types Vibration; MP3, WAV ringtones

Loudspeaker Yes

3.5mm jack Yes

- Active noise cancellation with dedicated mic

COMMS

WLAN Wi-Fi 802.11 a/b/g/n, Wi-Fi Direct, hotspot

Bluetooth v4.1, A2DP, LE

GPS Yes, with A-GPS, GLONASS, BDS

Radio FM radio

USB microUSB v2.0, USB Host

FEATURES

Sensors Fingerprint (front-mounted), accelerometer, gyro, proximity

Messaging SMS(threaded view), MMS, Email, Push Email, IM

Browser HTML5

Java No

- Fast battery charging

- MP3/AAC+/WAV/Flac player

- MP4/H.264 player

- Photo/video editor

- Document viewer

BATTERY

Non-removable Li-Ion 3000 mAh battery