Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 783 193
2) Placement test : grammar for beginners (anonyme) 6 000 884
3) A/AN (webmaster) 5 370 426
4) Auxiliary BE (webmaster) 3 226 802
5) Present continuous (webmaster) 3 002 720
6) Present simple (webmaster) 2 924 510
7) Present simple (webmaster) 2 600 609
8) Present continuous (webmaster) 2 440 130
9) Adjectives (webmaster) 2 095 216
10) A/an (anonyme) 2 018 247
11) Present perfect simple (webmaster) 1 649 596
12) Preterite (webmaster) 1 636 217
13) Vocabulary - Placement test (bridg) 1 620 747
14) Preterite (webmaster) 1 452 304
15) Short placement test (webmaster) 1 444 907
16) To be (bridg) 1 407 859
17) Present perfect (webmaster) 1 351 284
18) What time is it? (webmaster) 1 351 019
19) The alphabet in English (webmaster) 1 322 589
20) Adjectives (anonyme) 1 217 511
21) What time is it? (webmaster) 1 211 415
22) Numbers (webmaster) 1 189 527
23) 'A' ou 'An' (anonyme) 1 177 675
24) Two presents: present continuous, present simple (webmaster) 1 151 317
25) To be (bridg) 1 146 862
26) Comparatives / Superlatives (webmaster) 1 109 662
27) Numbers (webmaster) 1 072 232
28) CAN / MUST (webmaster) 1 059 803
29) THE/ A / AN / nothing (webmaster) 1 036 186
30) Comparatives (webmaster) 1 008 356
31) Family life (bridg) 1 002 129
32) Numbers > 100 (webmaster) 987 491
33) Future (going to/will/present continuous) (anonyme) 966 287
34) Plural (webmaster) 956 976
35) Superlatives (webmaster) 876 391
36) Adjectives (anonyme) 875 918
37) Simple present (bridg) 855 404
38) Spelled words N°1 (bridg) 851 316
39) Placement test beginners: Check your spelling (anonyme) 830 749
40) Introducing oneself (webmaster) 827 940
41) Adverbs of frequency (anonyme) 819 374
42) Family (bridg) 785 824
43) General test-End of high school / Beginning of university (webmaster) 783 936
44) Present simple (anonyme) 783 550
45) Frequency adverbs (webmaster) 778 724
46) Present BE + Ving (bridg) 766 878
47) Passive form (anonyme) 730 516
48) Genitive (webmaster) 724 471
49) Family tree (anonyme) 720 316
50) Preterite: simple or continuous? (webmaster) 718 239
51) Placement test (beginners) (lili73) 702 573
52) Past simple or present perfect (anonyme) 697 166
53) Future (webmaster) 676 735
54) Present perfect simple (bridg) 664 426
55) 2 Preterites (webmaster) 663 748
56) Preterite (webmaster) 622 635
57) List of 200 irregular verbs and audio (bridg) 617 441
58) Modals (webmaster) 613 455
59) Spelled words N°2 (bridg) 610 096
60) Modals (webmaster) 607 969
61) Height (webmaster) 606 932
62) Articles a / an / the (anonyme) 596 781
63) Plural forms (bridg) 578 554
64) Nationalities (webmaster) 575 025
65) Past continuous / Past simple (anonyme) 569 472
66) Irregular plurals (bridg) 554 592
67) Two presents: simple and continuous (webmaster) 550 513
68) Preterite (bridg) 550 009
69) Superlatives (frapedur) 541 944
70) Vocabulary: greeting people (here4u) 536 581
71) Give your opinion (bridg) 532 808
72) Adverbs of Frequency (bridg) 517 713
73) Present simple or continuous (anonyme) 513 278
74) Present perfect / preterite ? (anonyme) 512 297
75) Possessive case (anonyme) 481 369
76) Countries & nationalities (bridg) 474 325
77) Past tenses (bridg) 472 122
78) 'The' or nothing? (webmaster) 471 793
79) Introducing oneself (easy) (webmaster) 471 259
80) Passive voice (webmaster) 464 847
81) Present Simple vs. Past Simple (anonyme) 460 005
82) Questions : how to ask them (anonyme) 449 118
83) General Test II / End of high school / Beginning of universi (webmaster) 446 797
84) IN, ON, AT or TO? (webmaster) 446 258
85) Relative pronouns (webmaster) 445 957
86) Comparative of superiority (anonyme) 440 545
87) How to pronounce the final -ED? (past simple) (webmaster) 439 467
88) Relative clauses (webmaster) 424 188
89) Sounds: [h] (webmaster) 419 954
90) Comparative (anonyme) 415 250
91) Past simple (anonyme) 400 159
92) A/an/Ø (bridg) 399 691
93) Future simple (anonyme) 397 613
94) This / That / These / Those (webmaster) 393 120
95) Conditional (webmaster) 392 625
96) Passive voice (anonyme) 391 733
97) Comparing (webmaster) 388 524
98) Can / could/ may/ might (woodyrun) 380 587
99) Present perfect or past tense (anonyme) 379 083
100) Much, many, little and few (felin) 374 541
101) Personal pronouns (anonyme) 371 622
102) Preterite continuous (BE + -ING) (webmaster) 370 875
103) Genitive case (bridg) 368 917
104) Some, any, no, enough, too/too much/too many (webmaster) 368 640
105) Confusing words - Placement test (bridg) 364 925
106) Irregular verbs (webmaster) 364 417
107) Numbers from 1 to 10 (anonyme) 361 991
108) Past perfect simple, past perfect continuous (anonyme) 361 198
109) Present continuous or present simple (webmaster) 360 038
110) Present perfect or preterite? (anonyme) 358 705
111) Simple Past : regular verbs (anonyme) 354 633
112) Comparative Adjectives (bridg) 352 709
113) Who, Whom, Which, or Whose? (anonyme) 349 674
114) Past simple (video) (anonyme) 349 356
115) Past simple or past continuous (anonyme) 345 296
116) While / When (anonyme) 340 616
117) What time is it? (webmaster) 338 535
118) Modals (tinou) 337 100
119) Modal: may/might (anonyme) 334 637
120) Cardinal and ordinal numbers (anonyme) 329 197
121) The superlative (anonyme) 327 503
122) Possessive adjectives and pronouns (woodyrun) 324 958
123) How to talk about the weather (lili73) 320 957
124) Since and for (anonyme) 319 671
125) Flags (webmaster) 318 026
126) Irregular verbs (bridg) 316 595
127) Pronouns (woodyrun) 315 265
128) Prepositions - in, on, at (anonyme) 314 522
129) Tenses (anonyme) 312 874
130) Placement test 3 (webmaster) 310 899
131) Order of adjectives (webmaster) 307 004
132) Could/Couldn't (laure95) 306 636
133) Comparative (anonyme) 305 262
134) Adjectives and prepositions (anonyme) 304 497
135) Agreement Tags (webmaster) 304 438
136) Asking questions (webmaster) 303 627
137) Present perfect OR simple past? (bridg) 298 789
138) Questions in the past tense (anonyme) 298 368
139) Uncountable nouns (webmaster) 296 436
140) Superlative Adjectives (bridg) 296 289
141) Object pronouns (bridg) 296 131
142) Passive form (anonyme) 293 599
143) Placement test 1 (anonyme) 293 290
144) Present simple (anonyme) 292 102
145) Can/Must/Should (laure95) 291 050
146) Past perfect (lili73) 290 241
147) Prefer/rather (bridg) 289 997
148) Must or Have to? (woodyrun) 288 334
149) The/an/nothing (bridg) 285 763
150) To be (anonyme) 283 635
151) Can and can't (laure95) 282 857
152) Vocabulary: asking and answering (here4u) 280 492
153) Modal verbs (bridg) 277 628
154) Some / Any / no... (bridg) 274 963
155) Days of the week (bridg) 269 197
156) So / neither (anonyme) 264 584
157) Past simple (video) (anonyme) 264 088
158) Present continuous (chnawa) 261 775
159) Used to (bridg) 260 544
160) Should / must (anonyme) 260 219
161) Past tense (anonyme) 259 695
162) Vocabulary: on the phone (here4u) 258 815
163) Find out a quantity (webmaster) 258 748
164) Articles : a / an / the / Ø (anonyme) 258 283
165) Superlative + and adjective (anonyme) 257 761
166) Comparative and superlative (anonyme) 257 084
167) Numbers 1/100 (anonyme) 253 934
168) Modal can (video) (anonyme) 253 335
169) Comparatives (anonyme) 250 928
170) Relatives pronouns (who, which, that...) (anonyme) 247 888
171) A few, a little, few, little (anonyme) 246 274
172) Vocabulary: at the restaurant (here4u) 245 707
173) Would rather / would prefer to (anonyme) 244 771
174) Present continuous and the Going to form (anonyme) 243 205
175) Should/ have to/ must (anonyme) 240 964
176) Have something done (anonyme) 240 109
177) Used to/would (woodyrun) 238 204
178) The past (webmaster) 238 007
179) Future continuous and future perfect. (felin) 237 985
180) How to ask a question in English (bridg) 236 055
181) Pluperfect (webmaster) 234 416
182) I wish, if only (felin) 234 332
183) Some / any (younes91) 233 873
184) Countable or Uncountable? (webmaster) 233 756
185) Should / shouldn't (anonyme) 231 954
186) Present simple or continuous (bridg) 230 833
187) Adjectives - ing and ed (felin) 229 446
188) Hypothesis (webmaster) 228 639
189) Must or mustn't (laure95) 226 717
190) Auxiliary BE (anonyme) 226 602
191) Articles a/an/the/0 (bridg) 226 463
192) Article The or nothing (anonyme) 226 259
193) Present perfect with Ever - never - (anonyme) 226 137
194) Present continuous OR Present simple? (bridg) 225 702
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 124
196) To / in order to / so as to / so that (irish21) 221 004
197) Comparison (komiks) 220 860
198) Present perfect (bridg) 219 778
199) What time is it ? (anonyme) 217 887
200) Indirect speech (bridg) 217 707
