Im at a plateau? Help

I'll try to keep this short, but any more info needed let me know.

Stats

Height - 5 11'
Weight - 165 lbs
B/F - 15 %

Meals

[Meal 1]
Milk
oats 100g
peanut butter 20g

chickpeas 100g

[Meal 2]
Red Rice 100g
Broc**** 1oz
Carrots 3oz
Chicken breast 85g
Eggs 1

[Meal 3]
Creatine 5g
Whey gold 1.5 scoops
almonds 30g

[Meal 4]
Pasta 100g
cheese 20g
mullet 100g fish

[Meal 5]
oats 150g
milk
peanut butter 20g
yogurt 60g

Been eating like this for sometime and i have gained about 3kg. Ofcourse i been increasing the quantities, this is the current amount of what i eat which is 3100 calories. For the past 1 month i havent gained any weight but i have gained abit of strength. I did increase the quantity by 250 calories and didnt change. I'm currently studying and i do no other activities.

Current Program. Please dont go bashing me on this just looking for help.


INCLINE PRESS 10X3 <-> PUSH UPS 10X3
DECLINE PRESS 10X3
LATERIAL RAISE 10X3 (ARMS IN FRONT)
ONE ARM DB REAR DELT 10X3
EZ BAR TRICEP EXTENSION 10x3
TRICEP PUSH DOWN 8X3


RACK PULL 8X4
LAT PULL DOWN 8X4
ONE ARM ROW 10X3
BARBELL BICEP CURLS 10X3
EZ BAR PREACHER CURL 8X3
WRIST CURLS BEHIND BACK 15X3
EZ BAR REVERSE CURLS 10X3

BARBELL SQUATS 8X4
LEG PRESS 8X4
LEG EXTENSION 8X3
LEG CURLS 8X3
CALF RAISE 8X4
WEIGHTED DECLINE AB CRUNCH 10X3 + HANGING LEG RAISE
CABLE AB CRUNCH 10X3

Been doing this for about 4 months. I know it needs to be changed but need some recommended help. What should i do? What nutrition i need to edit or add? Im not rich since im still studying and nuts are quite expensive here. (i dont eat other than fish and chicken )

Im not sure if i missed something. Let me know. Thanks :)

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